F2: Flip Screen between graphics and text window

F3: Osnap on or off

F4: Tablet on or off (obsolete)

F5: Isoplane (obsolete)

F6: Dynamic UCS on or off

F7: Toggle "Grid" on or off. You can also type <Ctrl>G

F8: Toggle "Ortho" on or off. You can also type <Ctrl>O

F9: Toggle "Snap" on or off. You can also type <Ctrl>B

F10: Polar on or off

F11: Object Snap Tracking on or off

F11: null