Sounds just like what I remember Steve...
Back in that day, the brokers would write their orders on a piece of paper, and then their assistant would stick it in a pneumatic tube that would go to the person who got the order placed. I don't know if it was called in or run through a node.

Years later I built out a room for a company called Rotan Mosle that PaineWebber bought. The room was called a node. The orders went to the node and then on to NY or somewhere. I just installed racks and electrical outlets. All the actual equipment that placed the orders was then installed by others.

"Good times, Bad times, you know I've had my share"

https://soundcloud.com/sunset-poet-of-texas