Calling and controlling procedures

S procedures can be called and started both from the system level and from within procedures. They can be executed in the foreground, i.e. synchronously with the calling task, or in the background, i.e. asynchronously in a batch task. The command used for the procedure call must be selected appropriately. The commands CALL-PROCEDURE and INCLUDE-PROCEDURE are provided for the former situation, and for the latter there is the ENTER-PROCEDURE command.