The MULTI Editor implements all of the standard functions that is expected in a programming editor. It is fully configurable: the user can change the key bindings, the location and behavior of the scroll bars, the mouse behavior, the button bindings and the menu bar. All commonly used functions are bound to keyboard keys, so the user can perform most editing tasks without constantly alternating between the keyboard and the mouse.

MULTI's Text Editor enables a single, consistent edit interface for all host and target development combinations. The Editor is an integral part of the overall MULTI Development Environment as it can be invoked and controlled as an object by other components within MULTI. MULTI also supports other editors such as SNIFF+, vi, emacs, and brief, all of which can be invoked instead of MULTI's Editor.