Determining if variable or static string is passed to a Sub

[SMcNeill]

SUB SomeRoutine (a$, state)
   IF state THEN PRINT "Variable" ELSE PRINT }Static"
END SUB

Then just send the sub a call with the flag desired.

SomeRoutine a$, -1
SomeRoutine "Hello World", 0

There's no auto detection, but it's simple enough to pass a flag with that information.