Difference Express.vi and Sub.vi ?

[reteb]

I am still trying to master the LB7 semantics.

I do not fully understand the difference between an Express.vi and a Sub.vi.

Is every Express.vi a Sub.vi ?

What is a Sub.vi what an Express.vi is not ?

Thanks for explanation.

[reteb]

Please apologize, I posted errouneously on the wrong forum.