The cross realm environment requires interactions between the following computers and domain controllers.
- The driver computer runs the test cases by sending requests over the wire in the form of protocol messages.
- The local realm controller runs an implementation of the protocol that is being tested, which responds to the requests that the driver computer sends.
- The trust realm controller runs an implementation of the protocol that is being tested. which responds to the requests that the driver computer sends.
The cross realm environment may need interactions between the driver computer and application server roles.
- The SMB, http or Ldap server in local realm runs an application protocols depends on Kerberos.
- The SMB, http or Ldap server in trust realm runs an application protocols depends on Kerberos.

Note
Below part applies both Windows based computers and Non-Windows based computers in the test environment.
