How to setup Rational Doors client for new database along with existing
One answer
Questions for DOORS Classic should be in this forum
https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000001499
you need the command line switches.
....doors.exe -data 36677@server1
....doors.exe -data 36677@server2
each session will then point at a different server.