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To specify the search location, click Locations.
To specify the types of objects (user names) that you want to search for, click Object Types.
In the Enter the object names to select box, type the user name that you want to search for, and then click Check Names. If the user name isn't found, click Advanced to run an advanced search.
When you find the correct name, click OK.
The name will be displayed in the list of users in the Remote Desktop Users dialog box.
Click OK, and then click OK again.