As noted before, essentially all applications can be run remotely from another machine on a network or even over a dialup line. When you consider that almost every feature of Linux and its applications can be configured without rebooting, it's clear why Unix systems are favored by many administrators.
Remote maintenance is often not very important to the home user, but to a business user of Linux it can be critical. If the pager goes off in the middle of the night because the file server is full, it's nice to be able to just dial in and take care of it from home instead of having to drive in to work to sit down in front of the machine. Using kernel modules, even relatively major upgrades can be done remotely.
About the only things that can't be done remotely are hardware updgrades and full kernel upgrades. (Actually, even kernel upgrades can be done remotely if you're confident that nothing will go wrong...)
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