How to play Call of Duty: Modern Warfare crossplay with friends

[Windows Central]

Get your friends together to get your kill on
Call of Duty Modern Warfare's crossplay beta is with us, starting today (September 19) for those of you with the golden ticket, and on Saturday (September 21) for everyone else.
The beta will be the first time in the Call of Duty franchise that players on the Xbox, PC, and PS4 can party up and play together regardless of platform. Here's how you can do it.

Full story from the WindowsCentral blog...