HOW RMM works in DELL server?

Hi all,

    Good day! I'm still new in server world and I want to find out what is the use of RMM port in a DELL server. In my understanding RMM is use to remotely easy access the server. 

    Question? Can RMM  port support the application OS like Windows, LINUX or CENTOS  or it just in BIOS level?

    I appreciate your time to read and provide a simple answer to my question.

Thank you very much!

Cheers,

Jeff SJ