A. It is possible to specify a user account to use when connecting to a share using the /user switch, e.g.
C:\> net use k: \\server\share /user:domain\user
If you then attempt to connect to the server again with a different username an error will be given. A workaround is to connect to the server using its IP address rather than its NetBIOS name, e.g.
C:\> net use l: \\<ip address>\share /user:domain\user