Questions on installing CommandByEmail

To all,

I'm about to install the "CommandByEmail" extension and I am on 3.6.4. 

I have a couple questions:

1) Can I use the latest version with 3.6.4?
2) When I go to Tools->Offline I see what appears to be a form for 

creating a ticket. Is this the basic format to be used by those users
that want to use “CommandByEmail” to create/modify ticket via Email?

I know these questions may seem trite, but I haven't had any experience 

installing this stuff. Most of my time has been using it and we did not
set our RT session up to use this extension.

Thank you.

Kenn
LBNL