If you like doing things from the command line but you want the update progress bar , etc to pop up, then this is quite useful.
cd "C:\Program Files\Rational\ClearCase\bin"
"clearviewupdate" -quick -window 1f00f4 -windowmsg c14e -ws "Path Here"
If you don't want the update dialog to pop up you can use:
cleartool update "Path Here"