Fujitsu Siemens Computers BS2000/OSD - Manual (Page 98)

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Important key combinations Troubleshooting
8.3 Important key combinations
If your mouse is not working, you can use the keys + to move between the
windows of the X-Windows window system.
The following key combinations make your work easier:
+ Switch from the window system to the SINIX login screen
+ Return to the window system
+ Invoke login screen on console
+ Invoke SINIX-Windows
+ Invoke SINIX login screen
+ + Reboot command (SINIX not yet loaded)
ALT TAB
CTRL SysRq h
CTRL SysRq u
ALT SysRq h
ALT SysRq P1
ALT SysRq P2
ALT CTRL DEL