Lotus Notes Applications for team mail or team workflows does not have a "primary" person who should work for this. A group of people should reply or take an action for a request. We need unread marks per application - anyone have read that note, will be the answer.
Currently you have to make a script to mark a document read/unread - it will change the document. If it will work like unread marks, you will not change the note - it will be stored in an unread mark table on the server.
Or something like an other idea:
http://ideajam.net/IdeaJam/P/ij.nsf/0/E61C7D3E3B02E44586257744002B69E1?OpenDocument (it is not able to link that post with the other - "too many entries")