HP A4500A - VMEbus Single Board Computer 744 Motherboard Programmer's Manual page 43

Using ACSE/Presentation
Step 4: Release the Association
The process closes the association until it receives the positive release
response from Process B.
Process A monitors events with ap_poll() and receives the response by
calling ap_rcv().
If an association is released abnormally, for example, if a lower layer
problem occurs, a provider abort (A_PABORT_IND primitive) may be
received.
Figure 3-10 Response to Release
Process A
Process B
AP Environment A AP Environment B
ap_poll()
Responder
Initiator
ap_snd()
Communication Communication
ap_rcv()
Endpoint B
Endpoint A
release response
Chapter 3 43