Electronic Webform Filling...

I need to be able to fill in a webform programatically from a Visual Basic Program.

The webform consists of the following.

name field (text box)
2 x password fields (star text boxes)

3 other text boxes, and 4 combo list boxes.

I need to be able to create a program asking the user for a specific name and a password,

but the information given in the remaining boxes and combo are not important, however the last textbox must contain a email address with an '@' symbol.

Can anyone provide me with methodoogy, and prefered, a link to a project code that does such a thing.

TIA

Jason.