Web form logon with powershell?

Is it possible to authenticate to a site that uses like web forms (maybe not the right words…) with powershell?

I have a site I need to authenticate against before downloading reports, but I’m not sure how to authenticate with powershell to the site before starting a downloadfile job.

Any help or guidance would be greatly appreciated.

Thanks Rob, but that only helps if you are prompted for a password at the download.

I"m getting a 403 error, so I think I need a way to authenticate then prompt for a download. Just not sure how to go about it