I know you can login to the self service portal by passing the username and password through the URL:
https://login.salesforce.com/sserv/login.jsp?orgId=<orgId>&un=<username>&pw=<password>
However I would like to find a way to do this without passing this information via the query string. Is there a way to validate the user via an API, then pass a security token, or maybe Session ID to the URL instead?
Thanks!