Chapter 4-8: Runtime Subroutine's and Predefined Processes
CHECK GUI CLIENT
This routine has been updated. Use .CLIENT CHECK FOR GUI for new applications.
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.
