If you want to know who works on a remote computer or what kind of OS is installed on a remote computer then you should use LanSpy. This program will explore a remote computer in a few seconds and display the information that it was able to collect about it.

LanSpy is network security scanner, and can get different information about a computer: Domain and NetBios names, MAC address, Server information, Domain and Domain controller information, Remote control, Time, Discs, Transports, Users, Global and local users groups, Policy settings, Shared resources, Sessions, Open files, Services, Registry and Event log information.