A document summarizing v2019 and NextGen compatibility information is needed.

A document summarizing v2019 and NextGen compatibility information is needed.

You should publicize to users the features and commands that have been discontinued in NextGen.
Existing users who were using v2019 are confused when NextGen does not accept their previous operations after upgrading to NextGen.


e.g.) Commands that were available in Titan2019 have changed in NextGen, please provide compatibility information.