Using the $$user Variable in Native Applications
You can use the $$user variable to define customized login parameters for native applications. To do this, enter the $$user variable wherever you need to specify a user name.
For example, you can use the $$user variable to return the user name as a part of the login string for Remote Desktop. In this example, $$
user.example.com (in the Parameters field) resolves to the login string
ethan.example.com for Ethan or
richard.example.com for Richard.