CLIPS provides some of the most commonly needed I/O capabilities
through several predefined functions.
12.4.2.1 Open
12.4.2.2 Close
12.4.2.3 Printout
12.4.2.4 Read
12.4.2.5 Readline
12.4.2.6 Format
12.4.2.7 Rename
12.4.2.8 Remove