Most common in computer history, however, is the development of a de facto Help key location for each brand/family of computer, exemplified by the use of F1 on IBM compatible PCs.
or ESCAPE /.On a full-sized Apple keyboard, the help key was labelled simply as Help, located to the left of the Home.
In its place, a full-sized Apple keyboard has a Fn instead.
Atari 8-bit XL and XE series keyboards had dedicated Help keys, but in the group of differently-styled system keys separated from the rest of the keyboard.
Most of the Sun Microsystems keyboards have a dedicate "Help" key in the left top corner (left from the "Esc" key above block of 10 (Stop,Again,Props,Undo,Front,Copy,Open,Paste,Find,Cut) extra keys.