The double click time is the time between two consecutive mouse clicks that will cause a double click event. You can change the time from your VB Application by calling the SetDoubleClickTime API function. It has only one parameter. This is the new DoubleClick time delay in milliseconds. Declare Function SetDoubleClickTime Lib "user32" Alias "SetDoubleClickTime" (ByVal wCount As Long) As Long N.B. These changes affect the entire system.