What can double kamui do

So in general, I’d like to hear all of the abilities it’s capable of, and I have a few questions

Do kamui shuriken disappear when they hit something; like if another shuriken is thrown in response, would they both disappear?

Can a kamui user make their jutsu and weapons intangible?

Can a kamui user move while they’re intangible

Can a kamui user select specific parts of their body to make intangible

Theoretically, wouldn’t a double kamui user be able to teleport while intangible by using the long range in conjunction with short range

I’m trying to have a kamui user fight but I want to make sure I understand what it can and cannot do