The original IBM PC keyboard had 10 function keys at the left of the keyboard in a 2 -5 matrix. Current Mac keyboards include specialized function keys include 19 function keys. The most part have keys F1 with pre-defined actions through F12. Texas Instruments include usually a row of function keys with various preassigned functions. This mainframe keyboard had 12 function keys at the right of the keyboard in a 3 -4 matrix. PC XT keyboards and The original IBM PC had function keys F1 in two adjacent vertical columns through F10.
Many modern PC keyboards include specialized also keys for multimedia. Internet Explorer does list not this keystroke in the help menu. Function Keys are used also heavily in the BIOS interface.