Multiplicity only shares a mouse and keyboard...right? No video sharing? So my secondary box does need it's own monitor(s)? Or can it use one or more of those on the primary?

Here's my story. Prime box W8Pro 64-bit w/3 monitors. Mostly running  applications which for the most part were current as of W2K/XP's era (see no real reason to update, especially since in several cases there are no updated versions and in others the cost is thousands instead of the hundreds I paid).

They all run OK on 8Pro. But I worry that some update will break this, so I want a pure XP box available that I can switch on if I need to. Ideally then using at least one, perhaps two of the 3 monitors my present system uses.

Do not want to use virtual machines if only because I've simply not been able to wrap my mind around the virtual drives and all the other related stuff. Separate box is what I want. Or a dual boot with different system drives if I need to, in which case multiplicity would not be needed.

At this point I have not built my XP box, so I can't try it with a demo version of the software. just wanted a guess as to workability before beginning work.