Some ActiveX Controls' properties and methods expect and return screen coordinate values as "twips", or "twentieths of a point".
A "twip" is a device-independent unit used in the past by Microsoft, for example in Visual Basic.
A "twip" equals to 1/1440th of an inch. Since most screens are assumed to be 72dpi, 1 pixel is 14.4, or approx. 15 twips.
This means that the screen coordinates in pixels have to be converted by multiplying by 15 before passing to methods that expect twips.
ListView ActiveX Helper Functions
ActiveX Controls in MAXScript Rollouts