The way LOCKTIME works is we wait for a LOAD (svc8). When a LOAD is done, we check to see if the user exceeded LOCKTIME.
1. If the caller did not specify an ERRET on the LOAD, then a 806-4 abend can occur. 2. If the caller specified an ERRET, set R1 to contain 806, and R15 to contain 04, then return to the called via exit and timeout occurs.
So as long as an application issues an SVC8, LOCKTIME will work.