Not going to happen. Your best bet is to talk with the other realm admins and get some system set up that uses a md5 hash of some info (your site,time,a secret) that you can use as part of an URL that you link to them on. They can have that URL then create a hash of the same info and see if they match to do auth. The real only way to pass basic auth in a link is to do http://<user>:<pass>@site/index.html but this breaks on some load balancers/proxies and also does not work with usernames or passwords that have email addesses in them (because of the second @). Also it allows your end users to see the plaintext user/pass.

-Waswas

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