Message Constants

[Bieb]

Where can I get a listing of all of MASM's uMsg constant values, and what they're for?

[donkey]

The message constants are Windows constants, not MASM constants, they are not specific to any language. You can find the values in Windows.INC along with the rest of the equates and structures. For their purpose you will have to look up each individual message in whatever Windows API reference you are using (Win32.HLP or the SDK or MSDN library).