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run SETI, burn a CD, have ICQ open, download some files, move 2 Gb over network, check E-Mail and surf with Netscape. After the burn and copying process are finished, shutdown all programs and play UT online ... >>
Used to do that all the time in Windows 98. Run OGR,
burn a CD (disc-to-disc... yes, on an IDE system), play in photoshop, surf the net, check my email,
all at the same time with a virus checker and my HotSync Manager, and a firewall program in the background. Then I'd go download some files, nef on AnandTech, etc., shut everything down, and go play UT online. Repeat as required (esp. the UT part

). (P.S. Note that SETI and OGR are set at minimum priority, so they're probably irrelevant.)
I could do this for days until I needed a reboot. However, if I didn't do all this stuff, I could leave the computer on for more than a week.
OTOH, after several months I still can't get one my CD-ROM drives working properly in Win 2000 (dual boot). :| I'll try again tonite, since I've done a complete wipe of my system and started over. Furthermore, half my software doesn't even run in Win 2000. Many now have updates, but many of those require buying the software again. :|
So, I DO think Windows 2000 is probably more stable if working correctly on a system, but for some of us either we've had problems with hardware drivers, or else the apps we own won't work with it so it's hard to recommend Windows 2000 to everyone. However, I have no doubt that when 2000 and supporting software are a little more mature, it will be much better and of course more stable than Win 98. My sysadmin friends won't even touch it with a 10 foot pole just yet though except for testing purposes and for personal use - still a bit buggy - won't let it loose on their networks. Until it ages a bit, I'm sticking with a dual setup.