logic & | && || logical operators The logical operations are bitwise-and (&), bitwise-or (|), logical-and (&&), logical-or (||). They work as in the C programming language: | and & do a bit-by-bit "or" or "and" of two numbers (expressed in binary for the task). || returns 1 if either input is nonzero, 0 otherwise, and && returns one if both inputs are nonzero, 0 otherwise.	from the library : Max Format : External Environment : max commercial Max 4.x http://www.cycling74.com