Debugging the front-end protocol

When setting the FGLGUIDEBUG environment variable to 1, information about GUI communication will be written to stderr by the runtime system, and the GUI protocol exchange will be indented for a better readability in the front-end log window.


Sensitive and personal data may be written to the output. Make sure that the log output is written to files that can only be read by application administrators.

UNIX™ (shell) example:

$ fglrun myprog 2>guidbg.txt

The output format of FGLGUIDEBUG is for debug purpose only and can change in next product releases.

In TUI mode, displayed screens can be dumped by setting the DBSCREENDUMP or DBSCREENOUT environment variables. This can be used to take a snapshot of the current TUI screen, for debugging or testing purpose.