[ms4w-users] KEYMAP.x vs. REF.x

[Giovanni A.]

Could someone explain me the use of KEYMAP.x? 
In the CGI reference I see REF.x but in the case of the "gmap" sample application the reference map automatically create a GET request with KEYMAP.x and KEYMAP.y, which is then handled with HTTP_GET_VARS('KEYMAP_x'): KEYMAP_x, not KEYMAP.x?!
I'm a bit confused, when does MapServer use the first CGI form or the second?
Thanks.
Giova
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