multiple users on single computer with multiple lotus notes .id's

I am managing IT services over the call center here at work.  We are getting ready to move everyone off of Citrix 1.8 and putting them strictly on the domain and manage them using group policies.  You may ask why we are doing this, but basically the citrix servers haven't been maintained at all over the last 5 years and we are running into more errors now that we are wanting to deal with.  Each call center employee has a domain username and password.  While most 90% of the time the users will never move to another computer there is a chance of it.  When I setup a users lotus notes on there computer it works just great.  But lets say that another user logs into that computer the next time it restarts.  The new users desktop appears, but when they enter lotus notes it pulls up the first users name and wants a password.  What I want is that everytime a new user logs into the same computer then it also pulls that users notes .id so they don't have to fool around with finding the correct user.  All notes .id's are stored on the mail server along with there .nsf database files.  Can someone help me figure out how to setup this up so when a new user logs into a single computer it also pulls that users notes .id.  Thanks for the help.