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Q152012: TP_IDs and CONV_Ids Cannot Be Shared Across Windows Processes

Article: Q152012
Product(s): Microsoft SNA Server
Version(s): WINDOWS:2.0,2.1,2.11,3.0,4.0
Operating System(s): 
Keyword(s): kbnetwork kbprogramming
Last Modified: 13-JUN-2001

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The information in this article applies to:

- Microsoft SNA Server, versions 2.0, 2.1, 2.11, 3.0, 4.0, on platform(s):
   - the operating system: Microsoft Windows NT 
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When you use the SNA Server 16-bit or 32-bit Windows APPC interface, the
APPC transaction program ID (TP_ID) and conversation ID (CONV_ID)
parameters are only valid from the Windows process (or task) that created
them. For example, if a 16-bit Windows APPC application receives a TP_ID by
calling TP_STARTED, and a CONV_ID by calling [MC_]ALLOCATE, the TP_ID and
CONV_ID are invalid if used by a different 16-bit Windows process. If
another process tries to use these parameters when calling the APPC
interface, the following APPC errors will occur:

  primary_rc = AP_PARAMETER_CHECK (0x0001)
  secondary_rc = AP_BAD_TP_ID (0x00000001)

  primary_rc = AP_PARAMETER_CHECK (0x0001)
  secondary_rc = AP_BAD_CONV_ID (0x00000002)

SNA Server 32-bit Windows applications that call TP_STARTED and
[MC_]ALLOCATE may appear to receive the same TP_ID and CONV_ID values.
However, the underlying SNA Server APPC interface recognizes these values
as unique because they are created by different process IDs.

Additional query words: prodsna

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Keywords          : kbnetwork kbprogramming 
Technology        : kbAudDeveloper kbSNAServSearch
Version           : WINDOWS:2.0,2.1,2.11,3.0,4.0

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