As a part of the eternal service to the Lord – Sri Vaishnawas should perform – Thiruvaradhana, Sri Ramanuja explained this in His Nitya grantham. The re-incarnation of Ramanuja – Sri Manavala Mamuni has elucidated this. The Prabandha Pasurams and Slokas that form part of this are published as a book. The devotees are advised to benefit by going through this great work. Let us watch the DVD.