In Windows 95, the first true multi-tasking
32-bit operating system for personal use, Microsoft added a few
new things. First, the taskbar, the bar that sits at the bottom
of the screen. Your active applications would appear as buttons
in the taskbar, and when you closed the application, the corresponding
button would disappear. This would allow you to run multiple programs
at once and switch between them. Well, Microsoft made a better, faster,
but not very well-known way to do this. By pressing Alt+Tab you would open
a little menu showing your active applications. Hold down the alt key and
press tab to switch between them, once you have highlighted the application
you want to switch to, let go and that application will be brought to the
front of your screen.