VirtualMac2009 wrote: 1. Yes, I have tried that with other Macs and it does work in general (see next paragraph). But it is not possible to use such procedure in the login window (no option there to do it).
What do you mean "(no option there to do it)"? I can use Virtual Machine > Send Key > Cap Lock
right no in the OS X Server Login! Image may be NSFW.
Clik here to view.
How to force reboot?
Have a look at: Image may be NSFW.
Clik here to view.Switch Power Commands from the Default Options
How to ssh login and reboot? Sorry for my ignorance.
You have to have Remote Login enabled to ssh into the system. Suggest you look in the Mac OS X Server Help and either Google ssh or in a Terminal type man ssh and press enter.