is there any program that allows you to post to a phpbb forum hosted by yourself on the same server?

thanks!

Why exactly do you want to post on your own phpbb forum, and what will it be? Like an automatic advert posting script?

well i post big price drops at amazon daily - i can post the deals on my site but am also thinking of having people talk about the deals in a forum (whether it's really a good deal or not, etc). so it would be nice if i can post the deal to a phpbb forum (or any other forum that's available on cpanel) as they are found.

Since it's on the same server you could just study the database and insert your posts directly via your favorite programming language's database interface. If you for some reason need to emulate browser interaction with your script rather than inserting your posts directly into the database you could try something like WWW::Mechanize for perl, or an equivalent for your language of choice.