confusion on mounting sd-ext(2/3/4)

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http://androidforums.com – Im beginning to think that Ive only actually gotten my sd-ext partition to mount a couple times on my phone ( samsung admire with cwm I downloaded a2sdgui and ran the script again twice (first said no sd-ext then ran and it basically acted as if my internal space was my sd-ext, saying the total available was 700mb instead of a gig). Other a2sd type scripts likewise fail, and checking for mount through terminal always shows no ext-sd partition mounted. NOW, what I would like to know is , what exactly mounts the sd-ext partition for the phone? Is it when init.d runs a scri (General)