If not overrided by option -s the file startup will be consulted at the beginning. An empty line causes the interpreter to enter the meta mode, which allows either to leave the interpreter, to purge the database, or to continue.
Abortion can be time consuming due to space deallocation.
Prolog allows to implement Prolog clauses in Modula-2. MPImports serves as importing link between the interpreter module and the own module. It is imported by the interpreter and should consist of imports only. This manual page is due to Andreas Borchert .