Wow, how do you access the web?
He uses linux (for youtube) or BeOS for some things: on the great intellistation.
But you really don't need much power for typical internet tasks.
For a long time I used my 300PL even though it was "outdated" even back then (mainly because my dad wouldn't get me a new computer), and that thing has 200 Mhz! I probably only had 64 mb of RAM (now I got the lovely 384), but a lot of things are still doable on old computers -- as long as the software is compatible.
Text writing, most internet stuff, music, pixel art, games, and all of that fun stuff can be done old old computers. It's probably a smarter idea as they suck less power.
Although I do need computational power for an audio rig (and 4 GB of RAM lol).