You want to determine which user was used to map a share drive in the Windows operating system environment.
Open the command prompt with Administrator right and execute any of below commands,
C:\>wmic netuse get remotename,username RemoteName UserName \\ITSITI\Test1 HOST1\daem \\ITSITI\Test2 HOST1\daem
C:\>wmic netuse where LocalName="Z:" get UserName /value UserName=HOST1\daem
Note: The LocalName is referring to the drive letter.