[MSDN Library April 2000] BM_GETCHECK (63.3971291866029%)
MSDN Library - April 2000 > Windows CE Documentation > Application Development > API Reference > User Interface > Messages
[MSDN Library June 1998] BM_GETCHECK (54.9003189792663%)
MSDN Library Visual Studio 6.0 > Platform SDK > User Interface Services > Controls > Buttons > Button Reference > Button Messages
[MSDN Library April 2000] BM_GETCHECK (54.9003189792663%)
MSDN Library - April 2000 > Platform SDK > User Interface Services > Windows User Interface > Controls > Buttons > Button Reference > Button Messages