[MSDN Library April 2000] UDN_DELTAPOS (78.0434782608696%)

MSDN Library - April 2000 > Platform SDK > User Interface Services > Windows Common Controls > Up-Down Controls > Up-Down Control Notification Messages

[MSDN Library April 2000] UDN_DELTAPOS (39.9679054054054%)

MSDN Library - April 2000 > Windows CE Documentation > Application Development > API Reference > User Interface > Messages