I heard that there are some programmes that allow to feel like you have 2 OS at once, that is to say, you can easily, without rebooting, switch between them. So I have the follwing question concerning to this.
How it is healty for the operation system on which you install that kind of soft? I mean can that soft harm to the OS?
What kind of softs you know that allow you to do that. Please list some of them which are most popular and reliable.
Can I use that kind of software in order to test a stand alon soft created by me on different platforms? Is it equivalent to the one I do on really differnt platforms?