Backspace Key

[1micha.elok]

Hi
I am working with some keydown event codes, but I can't seem to find the key code for the backspace key. 
Could you kindly advise me? Thank you!

Code:

#win32
set window "KEYDOWN",200,100,false,4
set redraw off

while not keydown(KEY_ESCAPE)
    set color 0,0,0
    cls
   
    set color 255,255,255
    set caret 10,10
    if keydown(KEY_INSERT) wln "Insert"
    if keydown(KEY_DELETE) wln "Delete"
    if keydown(KEY_HOME) wln "Home"
    if keydown(KEY_END, true) wln "End"
    if keydown(KEY_PAGE_UP) wln "Page Up"
    if keydown(KEY_PAGE_DOWN) wln "Page Down"
    'if keydown(KEY_BACKSPACE) wln "Backspace"
   
    redraw
    fwait 10
wend