OemKeyScan
OemToChar
OemToCharBuff
OffsetClipRgn
OffsetRect
OffsetViewportOrgEx
OffsetWindowOrgEx
OFNHookProc
OFNHookProcOldStyle
OpenClipboard
OpenColorProfile
OpenEncryptedFileRaw
OpenFile
OpenFileMapping
OpenIcon
OpenJobObject
OpenProcess
OpenSCManager
OpenService
OpenThread
OutputDebugString