WMIC, or WMI Command-line, or Windows Management Instrumentation Command-line, or whatever, is a condensed-form utility for running queries, pushing updates, and performing various WMI-related stuff via the CMD console.
It's very handy for quick checks on what your system is doing. For example:
> wmic os list brief
Will show you a top-level summary of your operating system information. In my case it shows the following:
BuildNumber Organization RegisteredUser SerialNumber SystemDirectory Version
7068 [blank] dood 00000-0... C:\Windows\system32 6.1.7068
Due to word-wrapping issues with Blogger, it's a bit easier to force a reformatting as:
Another useful query is:
> wmic os list free
This will dump a report of "free" physical and virtual memory, virtual page file space and the full name of your operating system:
Name: Microsoft Windows 7 Ultimate C:\Windows\Device\Harddisk0\Partition2
These are just two quick examples obviously. To find out more, open a CMD console on Windows XP, Vista or Windows 7 (or Windows Server 2003 or 2008 as well), and type "wmic -?" or drill-down like "wmic os -?" and it will provide syntax information for how to use this properly.