INT region = 0
The graphic of the process is only displayed in its region, even if the x and y coordinates are outside of the region, the part inside the region will still be displayed.
A region is a rectangular field inside the screen. It can be defined with define_region() and can be useful for displaying graphics in only certain parts of the screen and for the function region_out(). There are 32 regions (0..31) and region 0 is the whole screen.