We have discussed often omniscience and omnipotence and there meanings in relation to the reality of our Father in Heaven. Less discussed is Omnipresence. The LDS Guide to the scriptures defines omnipresence simply as â€œGodâ€™s ability to be present everywhere through his spirit.â€  Robert Millet opines, in his article â€What is our Doctrine?â€ a sort of clarification to this. He says â€œOur Father in Heaven is indeed omnipotent, omniscient, and, by the power of His Holy Spirit, omnipresent.â€ 
It is unclear what Millet means in this, though if his opinion is that the Holy Spirit (the third member of the Godhead) is omnipresent in a physical way, he is in disagreement at least with one prophet of the Church, Joseph F. Smith, who said â€œThe Holy Ghost as a personage of Spirit can no more be omnipresent in person than can the Father or the Son, but by his intelligence, his knowledge, his power and influence, over and through the laws of nature, he is and can be omnipresent throughout all the works of Godâ€  President Marion G. Romney concurred with this assessment, noting that God is â€œin spirit, and power, and influenceâ€”an omnipresent personâ€  Others also shared this view. 
To add to the Confusion, Francis M. Gibbons  opines that Jesus Christ â€œthrough the Light of Christ, â€¦ is omnipresent.â€  and others held that Christ was omnipresent in other ways as well. 
And with that tangled introduction, my friends, that leads me to my questions.
1. If Heavenly Father and Jesus Christ have just as much capacity to be omnipresent as our Father in Heaven, what is the need for the Holy Ghost?
2. Why can not Heavenly Father or Christ be our comforter, answer our prayers, or interact with us directly via their omnipresent power and influence?
3. What are the Limits of Divine Omnipresence?
4. If we can not stand the presence of God, due to our unworthiness, and he is omnipresent, is God withholding his presence from us for our protection or is it only the perceived presence of God we can not withstand in sin?
 see here
 see the First full paragraph of page 29, here
 (Gospel Doctrine, 5th ed. [Salt Lake City: Deseret Book Co., 1939], p. 61). As quoted here The lesson for the Aaronic Priesthood adds itâ€™s own clarification: â€œthe person of the Holy Ghost can be in only one place at a time, but his power and influence can be omnipresentâ€”present everywhere at the same time.â€
 see here
McConkie also concurs that God the Father â€œby the power of his Spirit, is in and through all things. (Bruce R. McConkie, â€œThe Lord God of the Restoration,â€ Ensign, Nov 1980, 50) as does President Monson, who notes God â€œis omnipresent in spirit and power and influenceâ€ (Thomas S. Monson, â€œAn Invitation to Exaltation,â€ Ensign, Jul 1984, 69)
 Former secretary to the first Presidency, and author of an often ignored but excellent biography of David O. McKay at least the equal of the current one by Prince.
 See here . For the sake of brevity, I will not even begin to get into my lack of understanding of differentiation between the Light of Christ, The Gift of the Holy Ghost, the Influence of the Holy Ghost, etcâ€¦
for example, Hugh Nibley said â€œIn its sweep and scope, the Atonement takes on the aspect of one of the grand constants in natureâ€”omnipresent, unalterable, such as gravity or the speed of light. Just as for them, it is always there, easily forgotten, hard to explain, and hard to believe in without an explanation. But we are constantly exposed to its effects, whether we are aware of them or not, and to ignore it can be fatalâ€ (Hugh W. Nibley, â€œThe Atonement of Jesus Christ, Part 4,â€ Ensign, Oct 1990, 26)