a knowledge of how webservers handle and get information from cookies, the knowledge of how to post information to the server and a general knowledge of what happens when you log in, IE are u redirected to a page instantly or whatever.
Generally, if you don't know one of those 3 things, you are gonna have trouble without some sort of in depth tutorial. I'm sure there are some "using sockets with cookies" type tutorials online somewhere.
(assuming you mean log in as in log into, for example, an online browser game that is)
For when a page or lcation is passworded by the webserver itself, then all you need is to GET the page and add this at the end:
Authorization: Basic encrypted password
Using a packet sniffer you can find out what the red bit should be for that page.
Last edited by Danthemandoo; 24/11/04 11:43 PM.