Ok, you can usually log in tty1-6 which can be accessed with [CTRL]-[ALT]-[F1] through [CTRL]-[ALT]-[F6]. The first X server you start is started with the command 'startx' and will normally run on [CTRL]-[ALT]-[F7], to open another go back down to command (eg [CTRL]-[ALT]-[F2]) and type 'startx -- :1' which will open in [CTRL]-[ALT]-[F8] and you can do 'startx-- :2' etc...
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