Embedding Java application into external client

Hi, I'm very new to Java programming so I don't know if this is even the right place to ask, but here's what I would like to know how to do:

Create a 1-click file on my desktop (.bat? I'm not sure) which would load the following game client: RuneScape Classic - the massive online adventure game by Jagex Ltd.

So I just want to embed a Java application which is traditionally loaded via an internet browser into a small Java application. This might be called a 'Client wrapper' someone told me, if that helps at all.

Thanks :)

First off, you might want to check whether what you're doing is legal. Why do you want to do this?

This isn't illegal, I just want to load the client myself rather than having to load it in a browser.

Well you might want to look into Jagex's terms of service. Chances are, they probably don't want you doing this.