Here is a link to Bishop Robert Barron's thoughts shedding light on the rather abstract concept of the communion of saints by considering how the internet works. Some quotations from Barron's article:
"A machine of our contrivance (the internet) is capable of receiving and transmitting extraordinary amounts of information simultaneously to and from numberless locales. How much more thoroughly and powerfully, therefore, can an intelligence at a higher pitch of reality, in a qualitatively different dimensional system, receive and transmit information? . . . Can a saint receive and send a staggering amount of information? Why not?"
"In one of the prefaces for saints in the Roman Missal, we find this language: 'From their place in heaven, they (the saints) guide us still.'”
"The next time you receive some instruction on your GPS or make a call on your iPhone, think of the communion of saints."
LINK TO BISHOP BARRON'S FULL ARTICLE