| Button | The state of the mouse buttons, in which a bit is set if the button is down. The Button argument is a bit field, with bits corresponding to the left button (bit 0), right button (bit 1), and middle button (bit 2)values 1, 2, and 4, respectively. It indicates the complete state of the mouse buttons; some, all, or none of these three bits can be set, indicating that some, all, or none of the buttons is pressed. |
| Shift | The state of the Shift, Ctrl and Alt keys when the button specified in the Button argument was pressed or released. A bit is set if the key is down. The Shift argument is a bit field, with the least-significant bits corresponding to the Shift key (bit 0), the Ctrl key (bit 1), and the Alt key (bit 2 ). These bits correspond to the values 1, 2, and 4, respectively. Shift indicates the state of these keys. Some, all, or none of the bits can be set, indicating that some, all, or none of the keys is pressed. For example, if both Ctrl and Alt were pressed, the value of Shift would be 6. |
| x | The current X location, in Twips, of the mouse pointer. |
| y | The current Y location, in Twips, of the mouse pointer. |
