Here is an example of how to use the UNREGISTEREVENT command:
AUTONUM 1,1
LET OUTSTR$ = "Processing"
LET LOOPCTR = 200
LET TIMER5 = 17
LET TMP = REGISTEREVENT(TIMER5, 0, 1000)
DO WHILE LOOPCTR > 0
LET EVT = HANDLEEVENT()
IF EVT = TIMER5 THEN
LET A = SETVAR("device.frontpanel.line2",OUTSTR$)
LET OUTSTR$ = OUTSTR$ & "."
IF LEN(OUTSTR$) >16 THEN
LET OUTSTR$ = "Processing"
END IF
END IF
LET LOOPCTR = LOOPCTR - 1
SLEEP 1
LOOP
LET TMP = UNREGISTEREVENT(TIMER5)
LET A = SETVAR("device.frontpanel.line2","")
END
