The point of VPN? and SW's role?

So, what all can you do with the VPN that is provided by default for Smoothwall.  ONLY link together with other Smoothwall boxes?  If so, what is the point of that?
 
Here is my setup.
 
I am on DSL.  The router box is connected to the internet and to the red interface on my Smoothwall.  The green interface is connected to a switch which has an XP Pro box among others.
 
Is the following possible with the default smoothwall or what role would smoothwall play in this scenario?
I would like to set up a VPN connection between some computer on the internet, say my work machine, and my XP Pro box.  What needs done?
 
 

Thanks,

 

-Jason

 

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