I'd like to block use of my computer during night time, so people don't stay up late on it. Unfortunately it's running an old version of OS X (10.4.11) and can't run a newer version. The parental controls don't seem to include time restrictions. Firefox is limited to 3.6 with this version of OS X. Even if the whole computer can't be blocked, at least blocking the Internet access, or browser access, would be better than nothing. It's a house-hold communal desktop computer, so physically removing it every night would be sub-optimal. The only thing I've found that looks like it could work at all is Net Nanny, which is a paid program. I'll think about getting that if no one can suggest anything else. The people in question are not technically savvy, so it doesn't have to keep out black hats or something They know they shouldn't be on, so it seems more an issue of their personal will power. Hopefully you guys can help them.