I can't confirm it, but these TVMs may well be using XP Embedded, which I remember posting about on here in another context quite recently. This is not the same thing as XP which you might once have used (or, if you're unlucky, still use) on a home computer. However, confusingly, sometimes it seems the two have shared a logo on startup screens.
XP Embedded is designed for terminals with fixed use-cases - a TVM, ATM or other type of ticket machine being examples. It is designed to be modular and only load certain functions. In addition, partly due to the likelihood of such uses resulting in the terminal having a fairly long life doing only one or two main tasks, XP Embedded has also enjoyed considerably longer official support by Microsoft.
As for tickets from another station, this is certainly not one of the most important features of a TVM, though it is definitely useful if you know it exists. I've never found a passenger outside these forums who's ever known it to exist without staff showing them.