[MSDN Library June 1998] UnionRect (47.816091954023%)
MSDN Library Visual Studio 6.0 > Platform SDK > Graphics and Multimedia Services > GDI > Rectangles > Rectangle Reference > Rectangle Functions
[MSDN Library April 2000] UnionRect (47.816091954023%)
MSDN Library - April 2000 > Platform SDK > Graphics and Multimedia Services > Windows GDI > Rectangles > Rectangle Reference > Rectangle Functions
[MSDN Library April 2000] UnionRect (39.2528735632184%)
MSDN Library - April 2000 > Windows CE Documentation > Application Development > API Reference > Core > Functions