IF a#$ = < <= > >= <> b#$
| ELSEIF ...
An ELSE statement indicates the beginning of a code block inside an IF statement. This code block will be executed if the condition checked for by the IF statement evaluates to a false state.
IF a < b
PRINT "a < b", 100, 100
PRINT "a < b is FALSE", 100, 100
IF a<>b THEN PRINT "a is not b", 100, 150
a < b is FALSE
a is not b