Php connection with mysql?

Hi all, I have a question regarding the client IP address between PHP and MySql. The built-in mysql database have different privilege tables. When I log on to mysql through the internet browser, does mysql know where I am connecting from if I use mysq_connect(.....) function? From what I see, this function doesn't tell where I am connecting from, if this is true, those privilege tables are not helping to check on the privileges if the client is from browser. Does it have any other ways to tell mysql server where the client is connection from besides default localhost? Thank you, Calvin