You can use a PC to control the Profilux II in a couple of ways...
#1 - Connect the Profilux to your PC via the supplied RS232 Cable (Standard Serial Cable)
#2 - Add a LAN/WLAN card and connect to your Profilux via the same software over TCPIP
#3 - Add a USB card and connect your Profilux to your PC via USB
With any of these methods you can connect to your Profilux remotely. If you have some sort of Remote Control Software running on your PC (Windows XP Pro, Windows Vista Ultimate or Corp, or Windows 7 Ultimate or Corp have this functionality built in, its called Remote Desktop and only requires one port on a router to be opened) then you can connect over the internet to your computer and control it from there.
A Profilux 3 has more remote access functions built in such as a built in webserver, or you could connect in the same manner as I detailed above.