This API allows the programmer to determine whether or not certain keystrokes have been pressed.

GK,nn                  nn provides different functionality as follows:

GK                        Wait for the next keystroke and return to the calling program (used mostly

                             for processing through a list of records in an OL window).

GK,95                   Wait for the next keystroke, but if none is pressed in a specified number of

                             seconds, return the specified default function key value

                             SCREEN-NUMERIC-FIELD = Number of seconds before timing out

                             FUNCTION-KEY-VALUE = the default function key value

GK,97                   (Version 8.6 and higher) Check for Ctrl+Shft+D (view I/O history), called

                              by BEXTFH after each 10th I/O operation -- useful to helping to detect I/O looping.

GK,98                    Used in a few special cases to avoid screen flashing.

GK,99                    Same as plain GK call, except returns immediately if no keystroke has been

                              pressed (used during report printing).

Example 2:
A new paragraph has been added to GETKEY.PL, to facilitate using the timeout functionality.

       MOVE 10 TO SCREEN-NUMERIC-FIELD.

       MOVE "27" TO FUNCTION-KEY-VALUE.
       PERFORM GET-FUNCTION-KEY-WITH-TIMEOUT.

JEG