If you are using Domino version 4.6 or above, you can construct a URL for opening a document, even if you don't have a view which displays the document. You need to know the document's unique document ID. @DocumentUniqueID provides it. This will not work on versions prior to Domino 4.6.
The syntax of the URL is:
Where path specifies the location of the database, dbname.nsf is the database file, and documentid is the unique document identifier of the document. With appropriate change, the code may be used in LotusScript as well.