In addition to the callable services, APPC/MVS programming support provides an administrative utility that creates and maintains entries about TPs (TP profiles and side information) in Virtual Storage Access Method (VSAM) key sequenced data sets (KSDS). The entries in the VSAM system files provide information that facilitates the flow of conversations across sessions. The two types of entries are placed in different VSAM files—a TP profile file and side information file.

A TP profile file contains scheduling and security information for z/OS programs that are scheduled in response to inbound allocate requests. Each LU is assigned a TP profile file that contains information about the programs that will be associated with that LU. When an LU receives an inbound allocate request, it locates in its TP profile file the information necessary to retrieve and schedule the transaction program requested. A TP profile file can be assigned to more than one LU at a time.

Inbound allocate requests for which a server has registered are not scheduled, and therefore do not require a TP profile.