Signing in with HTTP POST
Users can sign in to FileMaker WebDirect custom apps with an HTTP POST request rather than use FileMaker WebDirect Launch Center or a custom homepage.
To open a custom app with a specific account name and password, link to the database you want to open (see Linking to a database from an HTML page), and include two HTTP POST parameters: user and pwd. Set the value for user to the desired account name, and set the value for pwd to the account's password.
Important Use SSL when signing in with an HTTP POST request. If you don't use SSL, the specified account name and password will not be encrypted and will be less secure.