Users of iNotes Access for Outlook will find that, despite sending meeting invitations with the "Request Response" box unchecked, the invitee will still be given the option to respond.
For example, an Outlook user ("Chair") creates a meeting for an Outlook invitee and unchecks the Actions->Request Response menu item (for Notes Client users, select the Delivery Options->"I do not want to receive replies from participants" menu item). The Outlook invitee accepts the Chair's invitation, and selects "Accept/Decline/Tentative", which then gives the invitee several response options ("Send response now", "Edit response before sending", and "Don't send response now"), in spite of the Chair's intent.