However, the direct explanation from the author, Aaron Giles, is
"DREAMM is a bespoke emulator for LucasArts games, including:

• classic adventure games (Maniac Mansion, Monkey Island, etc)
• the early 3D adventure games (Grim Fandango, Escape from Monkey Island)
• mid-90s Star Wars titles (Dark Forces/Jedi Knight series, X-Wing series, Rebel Assault series)
• mid-90s Indiana Jones titles (Desktop Adventures, Infernal Machine)
• other miscellaneous games (Afterlife, Mortimer and the Riddles of the Medallion, Outlaws)"