Manually Posting to an ASP.NET page

[Anthony Leuzzi]

I currently have a ASP website which requires a user to provide a user name
a password. There is a section of the page will lists all of the ASP.NET
applications the user has access to. These web sites will be secured
through forms authentication.

I am trying to figure out a way to authenticate the user with having them to
log in again. I was thinking that I could manually post the user name and
password to the login page for that application and I have had some success
using the HTTPWebRequest. However, I can get the click event of the login
button to fire. I know I need to indicate that the login button caused the
postback, but I haven't figured out a way to do that.

Is there another way to have a single signon for multiple websites?

Thanks in advance.
Anthony