If you have workstations that users share, there are a couple of ways to make them completely private to each user.
A previous top mentioned to use a user specific network drive as notes data directory. We do nearly the same but save a lot of space.
Instead of switching the complete notes data directory to a users home drive (on network) we just move the most important file to this location.
We moved following files to a users home drive (e.g. u:datanotes):
names.nsf
bookmark.nsf
headlines.nsf
desktop5.dsk
And now, how do we get access to these important files? We just put notes database links in the standard notes data directory (e.g. c:lotusnotesdata) and everything works fine.
A notes database link is just a text file named equal to the refering database, like names.nsf, containing the full path to the destination database:
To create a link to u:datanotesnames.nsf just put a text file "names.nsf" containing the string "u:datanotesnames.nsf" in first line in the notes data directory. You can use the same procedure to create a link to desktop.dsk.
By this way every user can log on every workstation an get his own desktop, adressbook .... Only replicas of special databases are not available from other workstation until they are created.
Take also in consideration that you just have to backup the users home drives on a server, not the local workstations!