Use this command to automatically pause the debugger (while it is in its "silent running" mode) upon the next instruction that contains a call to a function in an add-on DLL or inside of the program used to run your script (such as a call to one of Rexx Center's REXX-callable functions, or a call to a DLL add-on such as one of REXX GUI's functions).
The pause happens after the arguments passed to the function have been evaluated, but before the actual call.