The launch button for Windows is the Start button on the bottom left corner.
the F1 button
Nuke launch button
Current versions of Microsoft Windows contain a Start button, Quick Launch toolbar, taskbar, button area, and the tray status area. So do various implementations of Linux distributions.
Press the fire button
Start button.
Click the launch tutorial button and follow all the guides.
Oh, dude, the launch button in Flat Out 2 is like the nitro button, you know, the one that gives your car a boost of speed. So, if you wanna go zoom zoom past your opponents, just hit that launch button and watch your car take off like a rocket. Just don't forget to steer, or you might end up crashing and burning, which, like, wouldn't be cool.
Assuming you mean the "Show Desktop" button, you right click the start back and click "Properties" then check "Show Quick Launch".
to launch the weapons you need to press the L button
Quick launch
Hold down the Home Button to Launch Voice Control!
task bar