List program stack
DISPLAY CALLS [TO FILE <.txt filename> | (<expC>)]
The DISPLAY CALLS command displays on screen the name and line number of the current program or procedure/function and the program stack - program name and line number - from which it was called.
|TO <file>||The display output will be sent to the specified file. The filename can be substituted with a <expC>, enclosed in round brackets, which returns a valid filename. If no file extension is specified, then ".txt" will be used.|