Hello Umesh.
You can use RSAT to administrate your Domain Controller functions, RSAT is used for Windows 7. I think that it is a good way for you to test you full trust relationiship.
If you are using Windows Server you can just enable the "AD DS and AD LDS Tools" under the "Remote Server Administration Tools" features. doing it you will have access to the AD from the other domain if trust configuration is ok.
RSAT For Windows 7 - www.microsoft.com/.../details.aspx