Canvas height and width size TO resolution

Hello,
I positioned a canvas control at size of 600X400 [Height X Width].
I would like to know, what is the measurement units of thos parameters?

Is it possible to know the resolution only of the canvas board?
How many pixels there are in 400 width and how many in 600 height?
I repeat that the following dimensions (600X400) are numbers that I have entered the fields of the "Size/Position" .

Thank you very much for your help!
Eliran