Space - the spacebar
Tab
Enter (or Return)
Escape (or Esc)
Backspace (or BS)

Delete (or Del)
Insert (or Ins)
Home
End
PgUp
PgDn
Up
Down
Left
Right

ScrollLock
CapsLock
NumLock

Numlock ON	Numlock OFF
Numpad0	NumpadIns
Numpad1	NumpadEnd
Numpad2	NumpadDown
Numpad3	NumpadPgDn
Numpad4	NumpadLeft
Numpad5	NumpadClear
Numpad6	NumpadRight
Numpad7	NumpadHome
Numpad8	NumpadUp
Numpad9	NumpadPgUp
NumpadDot (.)	NumpadDel
NumpadDiv (/)	NumpadDiv (/)
NumpadMult (*)	NumpadMult (*)
NumpadAdd (+)	NumpadAdd (+)
NumpadSub (-)	NumpadSub (-)
NumpadEnter	NumpadEnter

F1 through F24 - The 12 or more function keys at the top of most keyboards.

AppsKey - this is the key that invokes the right-click context menu.

LWin - the left Windows logo key
RWin - the right Windows logo key. Note: unlike Control/Alt/Shift, there is no generic/neutral "Win" key because the OS does not support it.
Control (or Ctrl)
Alt
Shift
Note: The hotkeys Shift::, Alt::, and Control:: fire upon release of the key unless they have the tilde prefix such as ~Alt::. By contrast, a specific left or right hotkey such as LAlt:: fires when it is pressed down.

Note: For the most part, these next 6 keys are not supported by Windows 95/98/Me. Use the above instead:
LControl (or LCtrl) - the left control key
RControl (or RCtrl) - the right control key
LShift - the left shift key
RShift - the right shift key
LAlt - the left Alt key
RAlt - Note: If your keyboard layout has AltGr instead of RAlt, you can probably use it as a hotkey prefix via <^>! as described here. In addition, "LControl & RAlt::" would make AltGr itself into a hotkey.

PrintScreen
CtrlBreak
Pause
Break -- Since this is synonymous with Pause, use ^CtrlBreak in hotkeys instead of ^Pause or ^Break.

Help - this probably doesn't exist on most keyboards. It's usually not the same as F1.
Sleep - note that the sleep key on some keyboards might not work with this.

The following exist only on Multimedia or Internet keyboards that have extra buttons or keys:
Browser_Back
Browser_Forward
Browser_Refresh
Browser_Stop
Browser_Search
Browser_Favorites
Browser_Home
Volume_Mute
Volume_Down
Volume_Up
Media_Next
Media_Prev
Media_Stop
Media_Play_Pause
Launch_Mail
Launch_Media
Launch_App1
Launch_App2