v1.4-20300 (Feb 4 2008)
HideMainMenuBar is a very simplistic, small addon made to:
1) Show/Hide the main menu bar, either via a slash command or keybind
2) Remember the state (visible or hidden) and re-apply it on login
1) Other button addons that don't do this for you.
3) I like having a clean screen.
4) I also like having a keybind for when I want to see my latency or work with my bags.
Option 1: Set a keybind
Option 2: Type /hmmb into the chat window