WIZ-DOS (William Irving Zumwalt Demon Operating System) is the name of the (fictional) magical computer language used in Rick Cook's Wizardry series. Based on the Forth programming language, it is used to write spells. Debugging is very important, since a system crash can wipe out the user.
Spells are prefixed with the command word backslash, and followed by the command exe which starts the spell running.