DMSTL(<list name>);Returns the value (REAL) of the standard deviation of the mean of the waiting time of the messages that left the list (EL or IL) indicated in <list name>.
Example:
IF DMSTL(EL_Door_A) > DMSTL(Door_B) THEN Ch := 'A'
ELSE Ch := 'B';
WRITELN('Queue in door ',Ch,' had greater fluctuation');