Didn't the Dutch ISP Xs4all have this in past where you could remote control the lamps of a Christmas tree in their office? That's a long time ago, before WebSo

Didn't the Dutch ISP Xs4all have this in past where you could remote control the lamps of a Christmas tree in their office? That's a long time ago, before WebSockets or IoT existed. And the server, while being absolutely hammered, kept up.