This message is posted to the application queue associated with the window that is to receive the pointer-button information.

A double-click is recognized if all of the following are true:

• Two clicks are of the same button.

• No intervening pointing device button is pressed.

• The two clicks occur within the double-click time interval as defined by the SV_DBLCLKTIME system value.

• The two clicks occur within a small spatial distance. This is defined by the rectangle, the length of whose sides parallel to the x- and y-axes are respectively, the SV_CXDBLCLICK and SV_CYDBLCLICK system values. The first click is assumed to be at the center of this rectangle.

The keyboard control codes specified by "flags" reflects the keyboard state at the time the mouse message was initiated. This may or may not reflect the current keyboard state.