Run a Remote Jar file

How can I run a remote jar file?
There is a runnable jar (Java Application) file on server and my client program wants to run it on the client. What should I write for my client code to do this?
It is possible to load it directly into client memory and run it?
And basically, does a Jar file completely load into memory, when we are deploying it, or only required resources load?

I suppose you are not speaking of applets.
If Iunderstand your question correctly, you are looking for a way, the client always has newest software downloaded from the server.
If that is what you are looking for, try JavaWebStart.
You find tutorials on
If you just want the client to download an application (like an .exe) use a runnable jar!

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