Use /gun to rename a server-level group.
To use the /gun command, you must be a member of the Team Foundation Administrators security group. For more information, see Team Foundation Server Permissions.
Even if you are logged on with administrative credentials, you must open an elevated Command Prompt to perform this function on a server that is running Windows Server 2008. To open an elevated Command Prompt, click Start, right-click Command Prompt, and click Run as Administrator. For more information, see the Microsoft Web site.
Specifies the group identity. For more information on valid identity specifiers, see TFSSecurity Identity and Output Specifiers.
Specifies the new name of the group.
Required. Specifies the name of the application tier server.
The following example renames the group "Coho Winery Education" to "Coho Winery Product Support."
>tfssecurity /gun "Coho Winery Education" "Coho Winery Product Support" /server:MyATServer