Examples: IsAuthors property
This script checks if the From item in a document is of type Authors. If so, it adds Jeffrey Kinnamon to the item.
Dim doc As NotesDocument
Dim item As NotesItem
' ...set value of doc...
Set item = doc.GetFirstItem( "From" )
If item.IsAuthors Then
Call item.AppendToTextList( "Jeffrey Kinnamon" )
Call doc.Save( False, True )
End If