This geographic challenge has been, in my opinion, a significant problem for the OPC, a small denomination with congregations often separated by considerable distances from each other. While the 20th century has seen exponential increases in the speed of communication over distances, using high-speed communication can be expensive. So you write letters, and maybe it takes a week or two to get an answers, possibly too late to help when help was most needed. The struggling session can now send out an emergency appeal for counsel to scores of other sessions and hope to receive good advice while the problem is still gestating. Pastor-teachers can ask each other questions, propose ideas for critique, and share new insights across thousands of miles as if next door.
Young ministers can keep in touch with older mentors.
Three, four, ten, fifty people can carry on an active conversation without needing to drive long miles and tiring hours to meet. None of this requires any special ability. I who write am a technobooby. Somebody who knows how this all works set me up and showed me how. Computers and the world-wide web offer all kinds of possibilities, most of which I have not explored because I am still wading in the shallow end.