exit programs

Hi!

I would like to write an exit program (to restrict FTP, file transfer
and ODBC connections just to some users and occasions), but I cannot
seem to find a book to describe that...

May be You can point me to a V3R7 book (available from the AS/400 books
website (hopefully - in .pdf) or even send me an example of such an exit
program... 

I found out where can I install one (WRKREGINF), but I would like to
know what parameters does my program receive and how can it reject
requests and exactly which exit points do what...

Thanks in advance.

                        Best regards, Juris.
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