VERY GOOD ARTICLE, I LIKED THE PART ABOUT ANTARYAMI VERY MUCH - http://www.srivaishnavan.com/upload1/srivaish3.html
ANTARYAMI
Antaryami or "Suksma Vasudeva" is the form in which the ultimate reality Lord Vishnu exists in a very subtle from, in the hearts of all living beings.
Invisible and full of bliss, the Antaryami form is said to have two hands with crystal-like complexion dressed in yellow robes. "Antaryami" literally means one who controls from inside. In the Narayana Anuvaka of Taittiriya Upanisad (2-25/25-5-6-7)
"antarbahisca tat sarvam vyapya narayanahsthitah
Anantamavyayam kavigm samudre antam visva sambhuvam
Padmakosapratikasam hrdayam capyathomukham
Atho Nishthya vitastyam tu nabhyamupari tisthati
Hrdayam tadvijaniyat vis visvasyayatanam mahat"
It is stated that Narayana resides in that infinitesimal small place below the heart of every being shaped like an inverted lotus bud and appears to His devotees in a manner and form cherished by them, and with particular characteristics or qualities as worshiped by them. Smaller than the smallest and bigger than the biggest , the Lord resides both inside and outside of every individual or thing in the universe.
Since the Antaryami form (aspect) of the Lord resides in the heart and yogis realise Him seated there, the form is also called "harda".
As Antaryami, the Lord accepts manasika puja of the devotees, such as meditation, mental offering of sacred water, fruits, food etc. and mental salutations(Mangalsasanam).
Such worship to the Antaryami form can be done by anyone at any place and at any time. Although residing in every being , the Antaryami has no relation or link with the actions or fruits thereof undertaken by these beings.
At the time of the death of a person, Antaryami helps the souls to come out of the body through murdhanya nadi (top of the head) and escorts the soul to the Lords Abode viz. SriVaikuntham.
