- take a windows-machine of your choice
- click on “start”
- right-click “computer”
- choose “manage” (“verwalten” if locale=DE)
- authenticate if necessary
- right-click “computer management (local)”
- choose “connect to a different computer”
- enter the DNS-name of the target machine
- wait for connection
- go to “System Tools” -> “Local Users and Groups” -> “Groups”
- double-click “Remote Desktop Users”
- click “Add”
- add the desired user
done