F1 key
Displays help window that contains the help documentation of AutoCAD

F2 key
Display commands, input, keyboard input that you have to do

F3 key
Function enable / disable Osnap (Object Snap)

F4 key
Function enable / disable the tablet functions.

F5 key
Work to change these settings isoplane (isometric plane) for the representation in the form of 3D

F6 key
Functions to enable / disable the function's coordinates snap (the cursor) AutoCAD

F7 key
Function on / off the grid function

F8 key
Functions to enable / disable functions orthogonal

F9 key
Functions to enable / disable function snap

F10 key
Function on / off the tracking function of polar

F11 key
Functions to enable / disable the function object snap tracking

F12 key
Work for off function of dynamic input (AutoCAD 2006 & 2007)

"70 TRICKS Hidden AutoCAD" paper Handi Chandra