ABORT

 Stops any executing procedures and causes VAXTPU to wait for the next
 keypress.

 ABORT is a VAXTPU language construct, not a built-in procedure.  ABORT has
 no parameters or completion codes.  You cannot use the EXPAND_NAME
 built-in on ABORT.

 Example

 The following error handler stops execution of any currently executing
 procedures and returns back to VAXTPU's main loop:

    ON_ERROR
        MESSAGE ("Aborting because of error.");
        ABORT;
    ENDON_ERROR