Auto login link

Hi. I have small question. Is it possible to make a link containing login name and password witch will automatic login and redirect someone after clicking it?

I need to help customers login to this two auctions:
[url]https://www.iaai-bid.com/login.aspx[/url]
[url]http://www.copart.com/cgi-bin/buyer/index.dtw/fetch[/url]

Can anyone please help me with this?

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