Switchdesk not supported in Knoppix ?

1)Is switchdesk not supported in knoppix ??
If not, then how to switch desktops from Konsole(cui)

Code:

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:example : switchdesk xfce

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2)How should I clear the recent apps in the K menu/start menu in knoppix.

3)How do I clear the recently used commands
in konsole. I mean if I use history command I must not be able
to see what were the previous no of commands typed.I have
last 100 commands recorded instead of 1000 which is default.

Please reply folks ..... THANKS IN ADVANCE

@1 - log out and choose End Current Session, than choose new one
@2 - K-> Control centre -> Desktop -> Panels -> Menus
@3 - Edit -> Reset&Clear terminal?

answer for 2 and 3 is fine.
But my question for 1 is howto-from konsole / character user interface not desktop/xserver

Quote:

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Edit -> Reset&Clear terminal?

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Doesn't work.. and is not the solution

I had a look at man page for history which has a option/switch to clear.

the right command is

[root@localhost root] $ history -c
//followed by enter.(then try pressing up arrow key or type history(only one command can be seen))

I still cant understand how I accepted the answer earlier ;)