Number of Named Pipes Used Between MS-DOS Client and Server (60509)

SUMMARY

DCA/Microsoft Communications Server requires Microsoft LAN Manager version 2.00 or later to operate. The Communications Server MS-DOS and OS/2 clients use named pipe connections to communicate with OS/2-based Communications Server computers. These named pipe connections are handled transparently to the user as well as to the HLLAPI or APPC application programmer.

The following information describes how many named pipes are used by Communications Server clients when communicating to a server:

1. All 3270 traffic that flows between a client computer and a server is multiplexed through one named pipe connection.
2. All APPC traffic that flows between a client computer and a server is multiplexed through one named pipe connection.
3. If 3270 and APPC traffic is occurring between one client computer and one server, two named pipes are used (one for 3270 traffic and one for APPC traffic).
4. If a client computer has 3270 sessions active with two different servers, two named pipes are used (one named pipe for each server). This is also true for APPC. Please note that 3270 and APPC traffic is never multiplexed through the same named pipe to a server.