ArcMap window size

[GagagDa_Morvi]

I need to draw on the ArcMap window - but I have two questions:

(1) How to know the size in pixels of the ArcMap window? I need to know the size of the area where ArcMap renders the map.
(2) I also need to know how to transform coordinates to and from the local (i.e. screen coordinates of the ArcMap) and Map coordinates.

Will appreciate any help on the above!

[GagagDa_Morvi]

I need to draw on the ArcMap window - but I have two questions:

(1) How to know the size in pixels of the ArcMap window? I need to know the size of the area where ArcMap renders the map.
(2) I also need to know how to transform coordinates to and from the local (i.e. screen coordinates of the ArcMap) and Map coordinates.

Will appreciate any help on the above!

Anyone please! I need to know the geometries of the rendered features in the screen (or display)  coordinate system. Any help is greatly appreciated!