body: I would like to write a music player for Windows, in C++ or C#, and maybe sell it. I would like to use mciSendString, and I was wondering if I would have to pay any royalties to Microsoft.
  
  
  Question 1: Can I use ALL of C# .NET in making premium apps without paying for a license to Microsoft?
  
  
  Question 2: If not, can I use mciSendString, again without paying any royalties to Microsoft?
  
  
  
title: Programming languages and APIs licenses