what version(s) are best to help out? Windows 64 bit?

that and screen sharing

honestly that isnthe only thing that stopd me from going all in on teamspeak/mumble

i just need a screen sharing solution (not necessarily built into those tools)

you can swap their locations on bioslevel and never think about it again (unless one of your colleagues actually reads the labels, gets it wromg and you have to explain it to them)