TP_IDs and CONV_Ids Cannot Be Shared Across Windows Processes

Last reviewed: April 17, 1997
Article ID: Q152012

The information in this article applies to:

Microsoft SNA Server for Windows NT, versions 2.0, 2.1, 2.11, and 3.0

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
Keywords : kbnetwork kbprg snaappc
Version : 2.0 2.1 2.11 3.0
Platform : WINDOWS

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Last reviewed: April 17, 1997
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