The Modula-2 reports state that the contents of SYSTEM is system-dependant which gives a great freedom for implementors and declares every module which imports SYSTEM as non-portable. Luckily, a large subset of SYSTEM as given by [PIM3] is widely available on many implementations including Ulm's Modula-2 compiler. Following sections show which parts conform to [PIM3], which parts are not implemented and which goodies of SYSTEM are specific to Ulm's Modula-2 compiler.