XAMPP is an Apache server distribution which has MySQL, PHP, PERL, and some other softwares like phpMyAdmin. It's an extremely useful software which can be used to test a website locally on a personal computer.
Generally shortcut keys are a combination of Windows Logo, Ctrl, Alt, Shift, and a character key. (For example, Alt + F4, Ctrl + C, Ctrl + Alt + Delete, etc.) Using the keyboard shortcut keys you can easily and quickly execute commands on Windows and in many programs.
There are 12 function keys(F1, F2, F3, .., F12) located at the top of the keyboard.
Depending on the operating system(OS) of the computer, the behavior of function keys vary.