[MSDN Library June 1998] PtInRegion (48.6781609195402%)
MSDN Library Visual Studio 6.0 > Platform SDK > Graphics and Multimedia Services > GDI > Regions > Region Reference > Region Functions
[MSDN Library April 2000] PtInRegion (48.6781609195402%)
MSDN Library - April 2000 > Platform SDK > Graphics and Multimedia Services > Windows GDI > Regions > Region Reference > Region Functions
[MSDN Library April 2000] PtInRegion (42.7011494252874%)
MSDN Library - April 2000 > Windows CE Documentation > Application Development > API Reference > User Interface > Functions