Contains a truth value specifying the evaluation of the last IF argument, If the last timed operation timed out, $TEST contains FALSE (0); otherwise, it contains TRUE (1).
The format for the Test is:
$Test
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Examples of Test:
Example 1
IF x=+x DO ^WORK ELSE SET x=0
ELSE statement causes M to use the value of $TEST to determine whether to execute the rest of the line.