please, you don’t have to be offended. Seriously. In a forum, things sometimes go like with buddies. A sarcastic remark is made now and then. Just shrug it off and it's fine.
I think what you have in mind is hard to implement in a home environment. Unless you put a lot (a whole lot) of money into it and do it as has been hinted several times before via MS Terminal Server, VMware, Citrix, and the like. There are definitely also open source alternatives. What all have in common, however, is that you need an appropriate infrastructure. For some of these services, you are even forced to use certain hardware because, for example, VMware is not guaranteed to run reliably on all systems.
Your idea to do it via media cables and USB basically works, too. The multi-monitor setup and USB are just not so easy to implement. USB, for instance, works only over short distances. There are extenders, yes. But even those don’t handle the 20-30m needed within a house for central distribution.
I think everyone here just wants to help and support. Why else would anyone take the time to write here.
Be constructive yourself and share details. There are people here who really know their stuff. If they know exactly what the use case is, something useful might come out for you, contrary to your expectations.