The program does not allow duplicate Windows user names in different groups, so users added through Windows security groups cannot also be set to use Windows authentication as part of another group. If names in a Windows group match existing Raiser's Edge users, the program will not allow you to add the Windows group. So, it is important that you make sure to remove any users specified to use Windows authentication from other groups before including them in an Active Directory or LDAP (Lightweight Directory Access Protocol) group you want to add.
You can assign multiple users to a group either by adding an Active Directory group or via an LDAP query. LDAP is an Internet protocol that programs use to look up information from a server.