Goober asks us:

Is there a list of what all they keys are officially named?

I mean… what IS the middle mouse key official bind name?

The list is as follows:

  • tab
  • enter
  • escape
  • space
  • backspace
  • uparrow
  • downarrow
  • leftarrow
  • rightarrow
  • alt
  • ctrl
  • shift
  • ins
  • del
  • pgdn
  • pgup
  • home
  • end
  • kp_home
  • kp_uparrow
  • kp_pgup
  • kp_leftarrow
  • kp_5
  • kp_rightarrow
  • kp_end
  • kp_downarrow
  • kp_pgdn
  • kp_enter
  • kp_ins
  • kp_del
  • kp_slash
  • kp_minus
  • kp_plus
  • kp_multiply
  • capslock
  • joy1-4
  • aux1-31
  • mwheeldown
  • mwheelup
  • mouse1-5
  • pause

The middle mouse key is “mouse3″. Scorlling it will give you mwheelup and mwheeldown.

 

Source: VALVe Developer Community