http://web1:8889/forms/frmservlet is not the URL of your form. That is the address of the forms servlet.
You don’t run the form accessing that URL, you run the form from the IDE and that is the address you see in the browser, which is a little different.
If you want to access your forms from other machines, you will need to install an application server.
The developer suite includes the OC4J server which allows you to test your forms, but you can only use it to run your forms locally, on your development machine.