preview functionality with custom files

System

I would like to know how the Preview engine works. That is, how does it generate the filename to use for a preview? ALso how does the system clean up these preview files?

Reason I ask is becauase I have a TPL that not only generates the HTML file, but also runs Apache FOP to generate a PDF file. During preview I would like the user to preview the PDF as well (i do this by providing a link to the pdf on the html page). I would then like Teamsite to clean up my preview PDF file as well, like it does the HTML file. Is this possible... if so, any suggestions. I was trying to figure out how TST generates the filename "zz_tst_user_0_preview", but I'm not sure what the "0" is and i'm also not sure if TS will pick up the PDF is it is named like that.

-Mukesh

-mukesh