The Begin menu is the menu from which the player can play levels, access Settings, ProgressDOS and Help, and use the Shut Down menu to restart or shut down the game. If you are already playing a level, Load save will change to Continue. If you press it, the menu will close and you can continue playing. New game will remain the same, but if you press it, the game mode you are playing will be closed, and it will cost you 1 heart to close it.
From Progressbar 1 to NOT 3.60, the Begin Menu is named Program Controller. An extra program called Launcher is available from BarOS 7 to 14, H@ckgresh and BAR/X. In B OS it is called the "Main menu".
The Begin Menus are based on the Start menus that characterized the Microsoft Windows operating systems starting with Windows 95, Program Controller is based on Program Manager (from Windows 3.0 and 3.1x), the BarOS menus are based on the Apple Menu from macOS, and the BarOS Launcher is based on the Mac OS Launcher in Mac OS 7.0.1P and 7.5 to 9.2.2, and starting from BarOS 10, the Dock in Mac OS X.