What's Canadian Multilingual Standard?

The multilingual canadian keyboard is named "clavier canadien pour l'anglais et le français" or "clavier CSA". It's a canadian standard : CAN/CSA Z243. 200-92 (). Note : on the complete version there are Ù, Ç, À, È and É keys.

What is the difference between us keyboard and Canadian Multilingual Standard?

There's no difference except for the flag icon. It is presumably there so that Canadians don't have to be looking at the US flag all the time to type their language. The same holds for ABC, which is the same as US but no flag at all, for the rest of the world.

How do I get a Canadian multilingual standard keyboard?

In Windows 10 select Control Panel | Clock Language and Region | Language. Then select English ( Canada ). Choose options | Add an input method and then select Canadian Multilingual Standard. Add and save.