Hooking up and removing external devices?

I am curious if there is a proper way to hook up my keyboard, bluetooth mighty mouse and external monitor AND remove them properly? I seem to have trouble with the monitor upon removal... the screen on the laptop will blank blue then come back up, but sometimes my dock and desktop remain blank - the computer still thinks the external monitor is hooked up.
Should I remove these items while the computer is alseep, should I shut down before removing, is there a way to "eject" items?
Thanks for the help.
Phil

I seem to have trouble
with the monitor upon removal... the screen on the
laptop will blank blue then come back up, but
sometimes my dock and desktop remain blank - the
computer still thinks the external monitor is hooked
up.
I didn't think you were supposed to unplug a monitor while the computer is switched on.. ? maybe it's different with the new connectors they use, but as far as I remember it was always a big no-no.
as for the rest of it.. the bluetooth mouse doesn't need to be removed (does it?), just turn it off if you want I guess. the keyboard you can unplug or reconnect whenever you want. and if it's a wireless one, then you can just switch it off if you like.

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