Remote User's Network Connections/Mapped Drives

 HKU
   \S-  (select the GUID you want; Reference Volatile Env)
    \Network Notice the drive letter mappings under the key (here "r" and "Z")

        2016-10-16 10_31_00-Cortana

Take notice of the RemotePath and UserName

Here is the Registry info for r:
    2016-10-16 10_31_11-Registry Editor

Here is the Registry info for Z:
    2016-10-16 10_31_21-Registry Editor 

** You can delete these for an immediate removal of the drive