Pressing a function key while the program was executing (rather than waiting for input) caused the system to respond to a previous ON ATTN SYSTEM (for F10 key) or ON FNKEY ## SYSTEM statement.
Wrong object name in a DLL call
Remedy:
Enter GO to continue. Later, you may want to modify the program so that the default of ON FNKEY ## IGNORE is reinstated for all ON FNKEY statements
Correct the name, spelling or error-causing string or program statement