There are two ways of supporting this in Notes:
1) Use text pop-ups. You can also use @DBLookup's in pop-ups to look up code in a "help" database; this allows you to let someone edit the help in a centralized place instead of on the documents or forms.
2) Use a button that opens a help document in a help view.
@Command([FileOpenDatabase]; @DbName; "helpview";Key;"1";""); @Command([OpenDocument]; "0"); @Command([FileOpenDatabase]; @DbName; "helpview";"";"0";""); @Command([FileCloseWindow]);