Most PCI DVR have a client software that you have to install on the remote computer, but if your PCI DVR that can upload video to a webpage them it should be better and in that case i hope you have a static IP addresses , that will make things easier.

but like gresch said you at some point could use remote desktop if you have win xp pro.

those are just a few things to keep in mind, but you are in good hands with gresch he will be of lots of help.