The contexts in which people are unable to attend church services may have changed somewhat since the early prayer books, but the need remains: sometimes there are those who are sick, elderly, or otherwise incapacitated who need the visitation of their pastor (or other authorized minister) bring the ministry of the church to them. The Communion of the Sick, in the 2019 Prayer Book, is our template for such home or hospital visitations.
If people are unable to attend church due to, say, a global pandemic in progress, elements of this liturgy might help parish priests work out how to make door-to-door Communion visits also!
The full Saint Aelfric Customary entry for this rite can be found here: https://saint-aelfric-customary.org/customary-the-communion-of-the-sick/
There you will find guidance for selecting Psalm and Scripture according to the situation, notes about the need for recurring visits, and even insight and advice on how to handle preaching and prayers.