I'm constantly bringing up different client's Movable Type installs for maintenance, and typing out the full path to Movable Type gets old quick. If you install MT to a consistent location (/cgi-bin/mt/mt.cgi) as I do, I've got a little Firefox shortcut that will make your life easier.
In Firefox, go to the bookmark management/organization section. Create a new bookmark.
Name: Movable Type
Now just type 'mt yourclientsite.com' and Firefox does the heavy lifting. If you want a FastCGI rendition, just create another bookmark with mt.fcgi and set the keyword to 'mtf'. It's totally flexible, just put in your standard installation location and you're off!