The provided main program reads and executes commands from standard input. dmx 
Context: Reference Implementation. dmx
Commands are unique in their first letter so that is all that is required. - **case *words*** motivating *words* for subsequent commands. - **next** sequence through the items of the current page. See {{gtClass:Story class}} and {{gtClass:StoryItem}} - **test *word*** confirm that *word* is present in current item. - **find *word*** advance through items until *word* is found - **link** resume following the first link in the current item. - **back *word*** backup lineup to page with *word* in title. - **exit** stop command execution and exit main.