In Panther, if you connect to an Appleshare volume via the Network entry of the Finder, the volume never acually appears as 'mounted' - either on the desktop or in the Finder. You can just browse down into it in the Finder, just as if the 'Network' was one massive drive. This is all well and good.
...until you close your laptop, go somewhere else and try to use it again.
OK, first of all the Finder correctly reports that the drive is no longer available, and prompts you to disconnect. But, the umount process that tries to do the disconnect seems to go into a tailspin. It just sits there. And now the Finder becomes unresponsive, with the Rainbow of Death cursor. Next, other applications refuse to respond to disk activities (open/save/etc).
So, you try opening Activity Monitor to see what's going on. Only Activity Moniter takes one sample, and then sits there gobbling 85% CPU and doing nothing. So you Force Quit it. You Force Quit the Finder too. Only now the Finder won't relaunch.
...slowly but surely you've entered a downward spiral.
You ssh in from another machine and kill the login window process. Great, you get dumped back to the login screen, and you log in again. Only now the Finder doesn't start up. And the menu bar extras are all missing, and Launch Bar just hangs.
Eventually you admit defeat, and do a 'sudo shutdown -r now' from the terminal.
All because you can't unmount Appleshare drives because they are not even shown as mounted !
This is a major **** up. This just happened to me.