CRD supports multiple user logins. On the installation of the server you will want to be sure that you have installed using the NT Service scheduler. Otherwise you will multiple reports firing off one after another.
I would also suggest that you use the SQL/ODBC file system for the installation otherwise MS Access could cause problems with locking the system file.
If this is being installed using Citrix Server you would need multiple installations. Tech support could give you more details if that is what you are planning.