One more Question With C$SYSTEM

 It seems to lock up the called screen when using "96" until I exit out of that called program.

Tried using C$SYSTEM XXXXX FLAGS. (Flags has a value of 1)

Tried using C$SYSTEM XXXXX 1.

Tried using C$SYSTEM XXXXX CSYS-ASYNC.

None of these work when trying to use C$SYSTEM (Seems to work like a ENTER key)
What am I doing wrong?