Property functions create and access a window's property list. A property list is a storage area that contains handles for data that the application wishes to associate with a window. The following list briefly describes each property function:
| Function | Description |
| EnumProps | Passes the properties of a window to an enumeration function |
| EnumPropsEx | Enumerates properties, passing data to the callback. |
| GetProp | Retrieves a handle associated with a string from the window property list |
| RemoveProp | Removes a string from the property list |
| SetProp | Copies a string and a data handle to a window's property list |