Multiple users on one machine and Dropbox
DropBox does not support not-logged-in users. The solution seems to be the following:

Log in and start Dropbox from the command line:

alias dropbox='/Applications/Dropbox.app/Contents/MacOS/Dropbox &amp;'
dropbox # start it.

ps aux | grep -i dropbox # shows multiple instances running


The above technique seems to work. Error messages are sent when the second Dropbox launches:

already someone listening at socket

RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.


But everything appears to work.