Second, I can't seem to find a way to add a new entry -- one that is not already in the tree. I wanted to add an Enum for the ShellProcCode -- the values that can be returned as the code for ShellProc events. I don't see one there unless it is under some other name. But a search for HSHELL_WINDOWCREATED came back empty. So, it seems it isn't there yet.

    /// Prevents a ShellProc hook procedure from receiving an HSHELL_LANGUAGE hook code when the new input locale identifier is loaded. This value is typically used when an application loads multiple input locale identifiers one after another

///         information, see the ShellProc hook procedure.

static extern TODO ShellProc(TODO);

Declare Function ShellProc Lib "user32.dll" (TODO) As TODO