[pptp-server] PoPToP install clarification

[Chris Williams]

I'm new to PoPToP and VPNs in general.  I think I get the basic idea.  In
the PoPToP user guide, it refers to the /etx/pptpd.conf and says the
contents should look like:

speed 115200
localip 192.168.0.234-238
remoteip 192.168.1.234-238

What do the local and remote IP's mean?  Does it have anything to do with
my current IP or can I assign the clients any old IP I want?