Custom Filter hooks

Hi all,
I am using “Custom Field Template” by Hiroaki Miyashita. I would like
to get the filter for the custom fields… I have tried using get_post_custom(), get_post_meta(), Get_meta, and others… I have no clue how to do this, getting the content of the page is simple, i just use the_content. and getting the title is simply the_title. Is there any type thing like that for custom data… like the_custom?
Thank you!