Keys of Ministering of Angels

The Aaronic Priesthood has the "keys of the ministering of angels." (D&C 84: 26.) This raises these questions:
-Do the "keys of ministering of angels" guarantee the holder he will entertain angels?
-Does the ministry of angels depend entirely on possession of these keys?
-Does the appearance of an angel necessarily mean the one to whom the angel appears holds the Aaronic Priesthood? Even in the case of a woman, such as Mary? (Luke 1: 26-27.)
-If the appearance of an angel does not equate with holding of the Aaronic Priesthood, then does it equate with holding the keys of ministering of angels?
-Can the keys of ministering of angels be separated from the Aaronic Priesthood, or are they entirely confined to this priesthood?
-If the keys can be separated from the priesthood, then what is priesthood and what are "keys?"

We tend to gloss over a great deal and have too little curiosity about important questions. In The Second Comforter, I explained part of being "childlike" is to possess relentless curiosity about things you do not understand. We should try to get every answer to every question we can obtain from God. First through the scriptures. Then through prayer and inquiry.

What if "keys to the ministering of angels" are not coequal with the Aaronic Priesthood? Who or under what circumstances could angels minister in the absence of Aaronic Priesthood? Are there "keys" conferred whenever an angel ministers to a person, any person? If an angel appears to a woman in Tibet, does that appearance give her the "keys of ministering of angels" even if she is not Mormon? If so, what is meant by "keys of ministering of angels?"

If an angel has appeared to someone outside the church, and if, because of that, the person does hold some "keys" because of an actual appearance, what of the Mormon priest who has never had an angel appear to him? If he has never had an angelic visitor, does he still hold the "keys of the ministering of angels?"

Do "keys of the ministering of angels" guarantee angels will appear? If not, then what do the "keys" entail? What do they confer? Must an angel minister to the key holder if he demands it? Are angels subject to the keys or not? If not, then how should these "keys" be understood:
-As a right?
-As a privilege?
-As an invitation?
-As a matter to inquire into until you have understanding?