REX Manager Documentation
REX comes pre-programmed with REX Manager software. REX Manager allows you to pick which of the ROM or OS images is the one currently in use, and also supports management of RAM images.
REX Manager operates "behind the scenes" to make sure the currently selected Option ROM image is automatically enabled on every power cycle. This is an impressive trick since REX does not receive power while the laptop is off (unlike the RAM memory circuit).
REX Manager is started by running the program REXMGR.BA from Menu.