SO is for programming related problem. I think any questions having to do with technology x's compatability with platform y would get closed.
I'm not positive about your question (in terms of x and y, please give an example of what you mean) but I think that these people should be using Super User instead of Stack Overflow.
Super User is more for:
- computer hardware
- computer software
- personal and home computer networking
Stack Overflow's questions (straight from the FAQ) should have to do with:
- a specific programming problem
- a software algorithm
- software tools commonly used by programmers
- practical, answerable problems that are unique to the programming profession
If you were to ask a question similar to that (more code related, not just a plain question "if these work together") it MIGHT actually meet Stack Overflow (or Programmers on that note).
When you said Technology X be used with Platform Y, I thought you meant code's compatibility with certain OS's or something like that, but if the question is about the compatibility between two programming languages: Don't just ask if these work together. Do some research first, and if you ever run into any problems, Stack Overflow would be the place to go (for code!)
I'm not to familiar with Programmers, but you could review the FAQ, read some questions and check if your question is appropriate for that website.