CHECK GUI CLIENT
This subroutine checks to see if the current engine is connected to a GUI-enabled client. No arguments are passed to the subroutine. It simply sets the predefined field RETURN CODE to 1 if running under a GUI-enabled client.
The subroutine can be invoked via SUBR or GOSUB. However, if invoked via SUBR, it must not be invoked DETACHED.
The following example generates a message or warning depending on whether or not the user is running under a GUI-enabled client.
*
SUBR --- CHECK GUI CLIENT SUBPROCESS END? N FAIL 0
*
IF --- RETURN CODE EQ 1
T MESSAGE User is running under GUI-enabled client.
F WARNING User is not running under GUI-enabled client.
|