Run-Time Function: Checks the keystroke buffer for a recent console keystroke and returns .TRUE. if there is a character in the buffer or .FALSE. if there is not.
USE IFCORE
result = PEEKCHARQQ( )
The result type is LOGICAL(4). The result is .TRUE. if there is a character waiting in the keyboard buffer; otherwise, .FALSE..
To find out the value of the key in the buffer, call GETCHARQQ. If there is no character waiting in the buffer when you call GETCHARQQ, GETCHARQQ waits until there is a character in the buffer. If you call PEEKCHARQQ first, you prevent GETCHARQQ from halting your process while it waits for a keystroke. If there is a keystroke, GETCHARQQ returns it and resets PEEKCHARQQ to .FALSE..
CONSOLE DLL LIB
USE IFCORE
LOGICAL(4) pressed / .FALSE. /
DO WHILE (.NOT. pressed)
WRITE(*,*) ' Press any key'
pressed = PEEKCHARQQ ( )
END DO
END