First guess; the BIOS.
Second guess; the CPU.
There are various commands associated with computer window that is: Run (Win+R), Windows Explorer (Win+E), Show Desktop (Win+D), Search (Win+F) Locked (Win+L)
window bar
task pane
Task pane.
Ribbon
task bar
window
An area at the top of an office program window that contains commands for working with the open file; the commands are organized under tabs
On a Windows machine it's typically called "My Computer".
A window
ewan
Go to your DOS window and type help, then hit enter. It will list the commands for you with a description of what they do.