Coordinate functions convert client coordinates to screen coordinates (or vice versa), and determine the location of a specific point. These functions are useful in graphics-intensive applications. The following list briefly describes each coordinate function:
| Function | Description | |
| ChildWindowFromPoint | Determines which child window contains a specified point. | |
| ClientToScreen | Converts client coordinates into screen coordinates. | |
| DPtoLP | Converts device points (that is, points relative to the window origin) into logical points. | |
| LPtoDP | Converts logical points into device points. | |
| ScreenToClient | Converts screen coordinates into client coordinates. | |
| WindowFromPoint | Determines which window contains a specified point. |