Problem in opening connection with SQLCE3.5

Discussion in 'microsoft.public.sqlserver.ce' started by arnodieter, Aug 8, 2008.

  1. arnodieter

    arnodieter Guest

    I've written an application for inventory and price enquiry. The application
    is written in c# using VS2008, .NetCF2.0 and SQLCE3.5. The device where the
    application must run is a Symbol/Motorola MC1000 which has very poor
    performance and very little memory.
    Sometimes the connection doesn't open. It seems to me, that the device is
    "swapping memory" and therefor needs longer than the sqlce-server aspects.
    - Who can I workaround these problems?
    - Why is the timeout-property of the connection read-only and defaults to
    "0"?

    Thanks in advance
     
    arnodieter, Aug 8, 2008
    #1
    1. Advertisements

  2. When the connection fails to open, actually examine the exception that is
    thrown by the Open operation and see what that's telling you. There's no
    good reason to believe, based on what you've told us, that a timeout is
    happening.

    If there's no memory, nothing other than using less memory is going to help.
    You could dump the .NET CF and write C/C++ code using OLE DB, I think,
    although I've never done that. You could try adjusting the Memory settings
    on the Memory Control Panel applet for the device to give more memory to the
    programs and less for storage. You could stop running some of the programs
    that you have running.

    There's little or not swapping going on. Windows CE does not support a
    'paging' file, so no data is *ever* swapped out.

    Paul T.
     
    Paul G. Tobey [eMVP], Aug 11, 2008
    #2
    1. Advertisements

  3. Have you tried setting Connect Timeout=500 or some such in the connection
    string? Does that make any difference?
     
    Ginny Caughey MVP, Aug 11, 2008
    #3
  4. There is no concept of ConnectTimeout and QueryTimeout with SQL CE. If at all they are parsed, they are parsed and ignored as these timeout business is when client has to wait for server's response. In case of SQLCE, connecting and querying is just another function call and so timeouts do not matter.

    So we have to rule out timeout possibility. Now coming to on what and all could be the reason why a connectino could fail are:
    1) Connection String information is wrong - SqlCeException should contain the exact details of what is wrong
    2) Not enough memory to load all the engine in memory. Please refer to blog articles: (Link1, Link2)

    Thanks,
    Laxmi [Disclaimer: All postings are as-is and confer no rights]
     
    Laxmi Narsimha Rao Oruganti [MSFT], Aug 12, 2008
    #4
  5. Thanks for the details, Laxmi!

    --

    Ginny Caughey
    Device Application Development MVP


    There is no concept of ConnectTimeout and QueryTimeout with SQL CE. If at all they are parsed, they are parsed and ignored as these timeout business is when client has to wait for server's response. In case of SQLCE, connecting and querying is just another function call and so timeouts do not matter.

    So we have to rule out timeout possibility. Now coming to on what and all could be the reason why a connectino could fail are:
    1) Connection String information is wrong - SqlCeException should contain the exact details of what is wrong
    2) Not enough memory to load all the engine in memory. Please refer to blog articles: (Link1, Link2)

    Thanks,
    Laxmi [Disclaimer: All postings are as-is and confer no rights]
     
    Ginny Caughey MVP, Aug 12, 2008
    #5
  6. arnodieter

    arnodieter Guest

    Hello Ginny.

    As you should remember: timeout property is readonly...
     
    arnodieter, Aug 13, 2008
    #6
  7. arnodieter

    arnodieter Guest

    Thanks for the tips.
    The solution was 2) Not enough memory. I've installed an additional memory card and the application is also installed on the memory card. Now the problem is solved.
    But I'm still wondering why there isn't a useful error message from the ..NETCF or the SQLCE and why the error occured only sometimes.

    Regards

    There is no concept of ConnectTimeout and QueryTimeout with SQL CE. If at all they are parsed, they are parsed and ignored as these timeout business is when client has to wait for server's response. In case of SQLCE, connecting and querying is just another function call and so timeouts do not matter.

    So we have to rule out timeout possibility. Now coming to on what and all could be the reason why a connectino could fail are:
    1) Connection String information is wrong - SqlCeException should contain the exact details of what is wrong
    2) Not enough memory to load all the engine in memory. Please refer to blog articles: (Link1, Link2)

    Thanks,
    Laxmi [Disclaimer: All postings are as-is and confer no rights]
     
    arnodieter, Aug 13, 2008
    #7
  8. arnodieter

    arnodieter Guest

    The question why there is a timeout property which is readonly and defaults
    to 0 is still not answered!?

    Kind regards
     
    arnodieter, Aug 13, 2008
    #8
  9. Oh well, I thought I answered it implicitly in my reply. Anyways, it is
    there just for ADO.NET Compliance and nothing more. Since everyone derives
    from Db* base classes and ConnectTimeout is abstract virtual, we had to
    override to compile the code. We did it and also made sure to avoid
    applications depending on it by returning zero. Let us not debate on why it
    should not have been throwing an exception than zero.

    Thanks,
    Laxmi
     
    Laxmi Narsimha Rao Oruganti [MSFT], Aug 13, 2008
    #9
  10. arnodieter

    arnodieter Guest

    Ok that's an argument.

    Thanks.

     
    arnodieter, Aug 13, 2008
    #10
  11. arnodieter

    sabedin meha Guest

    Can I connect this device with an existing asp.net application? I need this device to scan barcodes and put them into a corresponding field in web application.

    Sorry if I posted this into wrong thread,

    Thanks



    arnodieter wrote:

    Ok that's an argument.Thanks."Laxmi Narsimha Rao Oruganti [MSFT]" <laxmi.
    13-Aug-08

    Ok that is an argument.

    Thanks.

    Previous Posts In This Thread:

    Problem in opening connection with SQLCE3.5
    I've written an application for inventory and price enquiry. The application
    is written in c# using VS2008, .NetCF2.0 and SQLCE3.5. The device where the
    application must run is a Symbol/Motorola MC1000 which has very poor
    performance and very little memory.
    Sometimes the connection doesn't open. It seems to me, that the device is
    "swapping memory" and therefor needs longer than the sqlce-server aspects.
    - Who can I workaround these problems?
    - Why is the timeout-property of the connection read-only and defaults to
    "0"?

    Thanks in advance

    When the connection fails to open, actually examine the exception that is
    When the connection fails to open, actually examine the exception that is
    thrown by the Open operation and see what that's telling you. There's no
    good reason to believe, based on what you've told us, that a timeout is
    happening.

    If there's no memory, nothing other than using less memory is going to help.
    You could dump the .NET CF and write C/C++ code using OLE DB, I think,
    although I've never done that. You could try adjusting the Memory settings
    on the Memory Control Panel applet for the device to give more memory to the
    programs and less for storage. You could stop running some of the programs
    that you have running.

    There's little or not swapping going on. Windows CE does not support a
    'paging' file, so no data is *ever* swapped out.

    Paul T.


    Have you tried setting Connect Timeout=500 or some such in the connection
    Have you tried setting Connect Timeout=500 or some such in the connection
    string? Does that make any difference?

    --

    Ginny Caughey
    Device Application Development MVP

    This is a multi-part message in MIME format.------=_NextPart_000_002C_01C8FCB5.
    This is a multi-part message in MIME format.

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    charset="iso-8859-1"
    Content-Transfer-Encoding: quoted-printable

    There is no concept of ConnectTimeout and QueryTimeout with SQL CE. If =
    at all they are parsed, they are parsed and ignored as these timeout =
    business is when client has to wait for server's response. In case of =
    SQLCE, connecting and querying is just another function call and so =
    timeouts do not matter.

    So we have to rule out timeout possibility. Now coming to on what and =
    all could be the reason why a connectino could fail are:
    1) Connection String information is wrong - SqlCeException should =
    contain the exact details of what is wrong
    2) Not enough memory to load all the engine in memory. Please refer to =
    blog articles: (Link1, Link2)

    Thanks,
    Laxmi [Disclaimer: All postings are as-is and confer no rights]

    message connection=20
    The=20
    which=20
    device is=20
    aspects.
    defaults to=20
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    <STYLE></STYLE>
    </HEAD>
    <BODY>
    <DIV><FONT face=3DArial size=3D2>There is no concept of ConnectTimeout =
    and=20
    QueryTimeout with SQL CE.&nbsp; If at all they are parsed, they are =
    parsed and=20
    ignored as these timeout business is when client has to wait for =
    server's=20
    response.&nbsp; In case of SQLCE, connecting and querying is just =
    another=20
    function call and so timeouts do not matter.</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>So we have to rule out timeout =
    possibility.&nbsp;=20
    Now coming to on what and all could be the reason why a connectino could =
    fail=20
    are:</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2>1) Connection String information is =
    wrong -=20
    SqlCeException should contain the exact details of what is =
    wrong</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2>2) Not enough memory to load all the =
    engine in=20
    memory.&nbsp; Please refer to blog articles: (<A=20
    href=3D"http://blogs.msdn.com/sqlservercompact/archive/2007/10/26/trouble=
    shooting-can-t-load-sqlce-dll.aspx">Link1</A>,=20
    <A=20
    href=3D"http://blogs.msdn.com/sqlservercompact/archive/2007/10/26/can-t-f=
    ind-p-invoke-dll-sqlcemenn-dll.aspx">Link2</A>)</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>Thanks,<BR>Laxmi&nbsp; [Disclaimer: All =
    postings=20
    are as-is and confer no rights]<BR></FONT></DIV>
    <DIV><FONT face=3DArial size=3D2>"Ginny Caughey MVP" &lt;</FONT><A=20
    href=3D"mailto:"><FONT face=3DArial=20
    size=3D2></FONT></A><FONT =
    face=3DArial=20
    size=3D2>&gt; wrote in message </FONT><A=20
    href=3D"=
    face=3DArial=20
    size=3D2>=
    face=3DArial=20
    size=3D2>...</FONT></DIV><FONT face=3DArial size=3D2>&gt; Have you tried =
    setting=20
    Connect Timeout=3D500 or some such in the connection <BR>&gt; string? =
    Does that=20
    make any difference?<BR>&gt; <BR>&gt; -- <BR>&gt; <BR>&gt; Ginny =
    Caughey<BR>&gt;=20
    Device Application Development MVP<BR>&gt; <BR>&gt; <BR>&gt; =
    "arnodieter"=20
    &lt;</FONT><A href=3D"mailto:"><FONT face=3DArial=20
    size=3D2></FONT></A><FONT face=3DArial size=3D2>&gt; =
    wrote in message=20
    <BR>&gt; </FONT><A href=3D"=

    face=3DArial =
    size=3D2>face=3DArial size=3D2>...<BR>&gt;&gt; I've written an application for =
    inventory and=20
    price enquiry. The <BR>&gt;&gt; application is written in c# using =
    VS2008,=20
    ..NetCF2.0 and SQLCE3.5. The <BR>&gt;&gt; device where the application =
    must run=20
    is a Symbol/Motorola MC1000 which <BR>&gt;&gt; has very poor performance =
    and=20
    very little memory.<BR>&gt;&gt; Sometimes the connection doesn't open. =
    It seems=20
    to me, that the device is <BR>&gt;&gt; "swapping memory" and therefor =
    needs=20
    longer than the sqlce-server aspects.<BR>&gt;&gt; - Who can I workaround =
    these=20
    problems?<BR>&gt;&gt; - Why is the timeout-property of the connection =
    read-only=20
    and defaults to <BR>&gt;&gt; "0"?<BR>&gt;&gt;<BR>&gt;&gt; Thanks in=20
    advance<BR>&gt;&gt;<BR>&gt;&gt; <BR>&gt;</FONT></BODY></HTML>

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    charset="iso-8859-1"
    Content-Transfer-Encoding: quoted-printable

    Thanks for the details, Laxmi!

    --=20

    Ginny Caughey
    Device Application Development MVP


    in message There is no concept of ConnectTimeout and QueryTimeout with SQL CE. =
    If at all they are parsed, they are parsed and ignored as these timeout =
    business is when client has to wait for server's response. In case of =
    SQLCE, connecting and querying is just another function call and so =
    timeouts do not matter.

    So we have to rule out timeout possibility. Now coming to on what and =
    all could be the reason why a connectino could fail are:
    1) Connection String information is wrong - SqlCeException should =
    contain the exact details of what is wrong
    2) Not enough memory to load all the engine in memory. Please refer =
    to blog articles: (Link1, Link2)

    Thanks,
    Laxmi [Disclaimer: All postings are as-is and confer no rights]

    ------=_NextPart_000_0098_01C8FC6A.9449B310
    Content-Type: text/html;
    charset="iso-8859-1"
    Content-Transfer-Encoding: quoted-printable

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
    <HTML><HEAD>
    <META http-equiv=3DContent-Type content=3D"text/html; =
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    <STYLE></STYLE>
    </HEAD>
    <BODY bgColor=3D#ffffff>
    <DIV><FONT face=3DArial size=3D2>Thanks for the details, =
    Laxmi!</FONT></DIV>
    <DIV><BR>-- <BR><BR>Ginny Caughey<BR>Device Application Development =
    MVP</DIV>
    <DIV>&nbsp;</DIV>
    <DIV>&nbsp;</DIV>
    <BLOCKQUOTE=20
    style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
    BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
    <DIV>"Laxmi Narsimha Rao Oruganti [MSFT]" &lt;<A=20
    =
    href=3D"mailto:"></A>&gt; =
    wrote in=20
    message <A=20
    =
    href=3D"@TK2MSFTNGP03.phx.gbl</A>...</DIV>
    <DIV><FONT face=3DArial size=3D2>There is no concept of ConnectTimeout =
    and=20
    QueryTimeout with SQL CE.&nbsp; If at all they are parsed, they are =
    parsed and=20
    ignored as these timeout business is when client has to wait for =
    server's=20
    response.&nbsp; In case of SQLCE, connecting and querying is just =
    another=20
    function call and so timeouts do not matter.</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>So we have to rule out timeout =
    possibility.&nbsp;=20
    Now coming to on what and all could be the reason why a connectino =
    could fail=20
    are:</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2>1) Connection String information is =
    wrong -=20
    SqlCeException should contain the exact details of what is =
    wrong</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2>2) Not enough memory to load all the =
    engine in=20
    memory.&nbsp; Please refer to blog articles: (<A=20
    =
    href=3D"http://blogs.msdn.com/sqlservercompact/archive/2007/10/26/trouble=
    shooting-can-t-load-sqlce-dll.aspx">Link1</A>,=20
    <A=20
    =
    href=3D"http://blogs.msdn.com/sqlservercompact/archive/2007/10/26/can-t-f=
    ind-p-invoke-dll-sqlcemenn-dll.aspx">Link2</A>)</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>Thanks,<BR>Laxmi&nbsp; [Disclaimer: =
    All postings=20
    are as-is and confer no =
    rights]<BR></FONT></DIV></BLOCKQUOTE></BODY></HTML>

    ------=_NextPart_000_0098_01C8FC6A.9449B310--

    Re: Problem in opening connection with SQLCE3.5
    Hello Ginny.

    As you should remember: timeout property is readonly...

    This is a multi-part message in MIME format.------=_NextPart_000_003A_01C8FD21.
    This is a multi-part message in MIME format.

    ------=_NextPart_000_003A_01C8FD21.FC2E73F0
    Content-Type: text/plain;
    charset="iso-8859-1"
    Content-Transfer-Encoding: quoted-printable

    Thanks for the tips.
    The solution was 2) Not enough memory. I've installed an additional =
    memory card and the application is also installed on the memory card. =
    Now the problem is solved.
    But I'm still wondering why there isn't a useful error message from the =
    ..NETCF or the SQLCE and why the error occured only sometimes.

    Regards

    im Newsbeitrag There is no concept of ConnectTimeout and QueryTimeout with SQL CE. =
    If at all they are parsed, they are parsed and ignored as these timeout =
    business is when client has to wait for server's response. In case of =
    SQLCE, connecting and querying is just another function call and so =
    timeouts do not matter.

    So we have to rule out timeout possibility. Now coming to on what and =
    all could be the reason why a connectino could fail are:
    1) Connection String information is wrong - SqlCeException should =
    contain the exact details of what is wrong
    2) Not enough memory to load all the engine in memory. Please refer =
    to blog articles: (Link1, Link2)

    Thanks,
    Laxmi [Disclaimer: All postings are as-is and confer no rights]

    ------=_NextPart_000_003A_01C8FD21.FC2E73F0
    Content-Type: text/html;
    charset="iso-8859-1"
    Content-Transfer-Encoding: quoted-printable

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
    <HTML><HEAD>
    <META http-equiv=3DContent-Type content=3D"text/html; =
    charset=3Diso-8859-1">
    <META content=3D"MSHTML 6.00.6000.16674" name=3DGENERATOR>
    <STYLE></STYLE>
    </HEAD>
    <BODY bgColor=3D#ffffff>
    <DIV><FONT face=3DArial size=3D2>Thanks for the tips.</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2>The solution was 2) Not enough memory. =
    I've=20
    installed an additional memory card and the application is also =
    installed on the=20
    memory card. Now the problem is solved.</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2>But I'm still wondering why there isn't =
    a useful=20
    error message from the .NETCF or the SQLCE and why the error occured =
    only=20
    sometimes.</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>Regards</FONT></DIV>
    <DIV>&nbsp;</DIV>
    <BLOCKQUOTE=20
    style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
    BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
    <DIV>"Laxmi Narsimha Rao Oruganti [MSFT]" &lt;<A=20
    =
    href=3D"mailto:"></A>&gt; =
    schrieb=20
    im Newsbeitrag <A=20
    =
    href=3D"@TK2MSFTNGP03.phx.gbl</A>...</DIV>
    <DIV><FONT face=3DArial size=3D2>There is no concept of ConnectTimeout =
    and=20
    QueryTimeout with SQL CE.&nbsp; If at all they are parsed, they are =
    parsed and=20
    ignored as these timeout business is when client has to wait for =
    server's=20
    response.&nbsp; In case of SQLCE, connecting and querying is just =
    another=20
    function call and so timeouts do not matter.</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>So we have to rule out timeout =
    possibility.&nbsp;=20
    Now coming to on what and all could be the reason why a connectino =
    could fail=20
    are:</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2>1) Connection String information is =
    wrong -=20
    SqlCeException should contain the exact details of what is =
    wrong</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2>2) Not enough memory to load all the =
    engine in=20
    memory.&nbsp; Please refer to blog articles: (<A=20
    =
    href=3D"http://blogs.msdn.com/sqlservercompact/archive/2007/10/26/trouble=
    shooting-can-t-load-sqlce-dll.aspx">Link1</A>,=20
    <A=20
    =
    href=3D"http://blogs.msdn.com/sqlservercompact/archive/2007/10/26/can-t-f=
    ind-p-invoke-dll-sqlcemenn-dll.aspx">Link2</A>)</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>Thanks,<BR>Laxmi&nbsp; [Disclaimer: =
    All postings=20
    are as-is and confer no rights]<BR></FONT></DIV>
    <DIV><FONT face=3DArial size=3D2>"Ginny Caughey MVP" &lt;</FONT><A=20
    href=3D"mailto:"><FONT face=3DArial =

    size=3D2></FONT></A><FONT =
    face=3DArial=20
    size=3D2>&gt; wrote in message </FONT><A=20
    href=3D"=
    face=3DArial=20
    =
    size=3D2>face=3DArial size=3D2>...</FONT></DIV><FONT face=3DArial size=3D2>&gt; =
    Have you tried=20
    setting Connect Timeout=3D500 or some such in the connection <BR>&gt; =
    string?=20
    Does that make any difference?<BR>&gt; <BR>&gt; -- <BR>&gt; <BR>&gt; =
    Ginny=20
    Caughey<BR>&gt; Device Application Development MVP<BR>&gt; <BR>&gt; =
    <BR>&gt;=20
    "arnodieter" &lt;</FONT><A href=3D"mailto:"><FONT =
    face=3DArial=20
    size=3D2></FONT></A><FONT face=3DArial size=3D2>&gt; =
    wrote in=20
    message <BR>&gt; </FONT><A =
    href=3D"face=3DArial =
    size=3D2>face=3DArial size=3D2>...<BR>&gt;&gt; I've written an application for =
    inventory=20
    and price enquiry. The <BR>&gt;&gt; application is written in c# using =
    VS2008,=20
    .NetCF2.0 and SQLCE3.5. The <BR>&gt;&gt; device where the application =
    must run=20
    is a Symbol/Motorola MC1000 which <BR>&gt;&gt; has very poor =
    performance and=20
    very little memory.<BR>&gt;&gt; Sometimes the connection doesn't open. =
    It=20
    seems to me, that the device is <BR>&gt;&gt; "swapping memory" and =
    therefor=20
    needs longer than the sqlce-server aspects.<BR>&gt;&gt; - Who can I =
    workaround=20
    these problems?<BR>&gt;&gt; - Why is the timeout-property of the =
    connection=20
    read-only and defaults to <BR>&gt;&gt; "0"?<BR>&gt;&gt;<BR>&gt;&gt; =
    Thanks in=20
    advance<BR>&gt;&gt;<BR>&gt;&gt; <BR>&gt;</FONT> =
    </BLOCKQUOTE></BODY></HTML>

    ------=_NextPart_000_003A_01C8FD21.FC2E73F0--

    The question why there is a timeout property which is readonly and defaults to
    The question why there is a timeout property which is readonly and defaults
    to 0 is still not answered!?

    Kind regards


    Oh well, I thought I answered it implicitly in my reply.
    Oh well, I thought I answered it implicitly in my reply. Anyways, it is
    there just for ADO.NET Compliance and nothing more. Since everyone derives
    from Db* base classes and ConnectTimeout is abstract virtual, we had to
    override to compile the code. We did it and also made sure to avoid
    applications depending on it by returning zero. Let us not debate on why it
    should not have been throwing an exception than zero.

    Thanks,
    Laxmi


    Ok that's an argument.Thanks."Laxmi Narsimha Rao Oruganti [MSFT]" <laxmi.
    Ok that is an argument.

    Thanks.


    Submitted via EggHeadCafe - Software Developer Portal of Choice
    ..NET Remoting - Marshal Objects ByRef
    http://www.eggheadcafe.com/tutorial...030-2743e473b8ac/net-remoting--marshal-o.aspx
     
    sabedin meha, Jan 21, 2010
    #11
  12. arnodieter

    LightStamp Guest

    Seems like you could wire a web service to interface the two but there would
    need to be a lot of messaging going on to interact
     
    LightStamp, Jan 21, 2010
    #12
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