Program Initialization Parameters (PIP) data is a means of presenting data to the partner's transaction program as part of the conversation initialization. PIP data is described in the SNA Transaction Programmer's Reference Manual for LU Type 6.2 as Send PIP Data (241) and Receive PIP Data (242).
On the receiving side, the PIP data is not received with the FMH-5 data. After issuing an APPCCMD CONTROL=RCVFMH5, if the FMH-5 indicates that the PIP data is attached (FM5PIPPR=B'1'), then the first APPCCMD CONTROL=RECEIVE will receive the PIP GDS variable X'12F5'.
See PIP data field for more information about building PIP data on a conversation allocation request.