Is there a different using a stack command is Asynch?
STACK command is never asynchronous. If you want to execute commands asynchronously, check out the CMTASK exit. See library SYSEXTP, modules ASYN* - find the one appropriate to the environment you are executing in.
What is it you want to do with STACK?
Well, I wrote a program that run asynch, and it execute other programs.
Like a scheduler, in order to run all, I want tp put them in a stack command.