Hi,
It all the depends on the application.
Normally a submitted form would send a HTTP POST requeste which means that the results are not sent as part of the query string. But, alot of applications do not separate between HTTP POST and HTTP GET, therefore you could first try to include each field in the form on the querystring
(http://<host>/page?username=%username%&password=%password%)
Note that this will be sent in clear text unless you use https.
If it doesn't support you have to first do a http get request with username password to a page locally on your portal which sets up the form for the target site based on the http get parameters, and then automatically submits it using javascript.
Cheers
Dagfinn
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