Usage notes

(end_seq) can be used only in conjunction with a Language Environment environment initialized by an (init_sub_dp) function code. A return code of 4 is set for environments initialized by other than (init_sub_dp).
Only (call_sub) or (call_sub_addr) invocations are allowed between the (start_seq) and (end_seq) calls.
The driver program cannot cancel any STAE or ESPIE routines.
This function can be called from an active environment if the Preinitialization environment indicated by token was created with the (init_sub_dp) function.