execut command via ssh

[dapim]

how can i execute commanda via ssh

this doesn't ssems to work
sshk nameserver | ls

[milosz.galazka]

ssh server command
for example:
ssh localhost ls

[HermanAB]

Or the pointy clicky way:
ssh -C -c blowfish -X user@server gnome-panel
ssh -C -c blowfish -X user@server kicker