i'm new to ArcObjects and i'm trying to make a program that uses an axmapcontrol and i wanted to zoom in and zoom out using the pointer , i've searched here and i've found this link which shows how to return x and y , i wanted to know what x and y do this lines of code return

<https://gis.stackexchange.com/questions/101928/how-can-one-get-the-value-of-the-point-where-the-axmapcontrol-is-centered-at>