@DEC[%var]: Returns the same value as @EVAL[%var - 1]. That is, it
retrieves and decrements the value of a variable. The variable itself is
not changed; to do so, use a command like this:
set var=%@dec[%var]
Created using Inf-PHP v.2 (c) 2003 Yuri Prokushev
Created using Inf-HTML v.0.9b (c) 1995 Peter Childs