[Wine] New to Wine and Linux/Ubuntu

[mikedn1982]

Hello All

I apologize for the basic questions, but I only recently discovered the benefits of Ubuntu/Linux as well as Wine.  As I basically know nothing, my questions are pretty simple:

1) As I will be using Linux/Ubuntu (along with wine) for business purposes, is Wine and what it does 100% legal?
2) Can I open and use both a Linux based program and a windows based program (using wine obviously) at the same time?
3) One program that I specifically have to use, which will require Wine, is not a complicated program (It is used to monitor telephone use in a call center), but at the same time is not a very well known or popular one.  Does anyone forsee any issues in Wine being able to run a program like this?

Thanks in advance!
Mike