This message delimits mouse button click events. Between a button-down and a button-up event, the mouse is considered to be dragging. A mouse click is considered to happen on button-down, and dragging is terminated by a button-up.

Click

Clicking in the text sets the cursor and anchor points to the nearest insertion point. If the MLE is in overtype mode, the anchor is extended one character further in the text, subject to the end-of-text and new-line boundary conditions, defined under WM_CHAR (in Multiline Entry Fields).
Shift-Click
Clicking while the shift key is held down sets the cursor point to the nearest insertion point, while leaving the anchor point alone.
Margin Mouse Event
All mouse events in a margin cause the MLE to send a MLN_MARGIN notification to the owner window of the MLE. This message has, as its parameters, the original mouse message. The owner can process the notification or not. If the owner does not process the message, the event is treated as if it occurred on the closest point in the text.

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