* A command that triggers a distant vessels program as itself, and the ability to pass a variable wildcard into the command.
# Vessel 8231(teapot): program warp to var.1
> call 8231 vessel.self.parent
| teapot warped to your location

alt:
# Vessel 8231(teapot): program var.1
> call 8231 warp to vessel.self.parent
| teapot warped to your location

Situation:
- You are waiting for the train(1313). You can call the train with the [button]
# button: program call 1313 warp to vessel.self.parent
# button: feedback The train arrives.
> use button
- The train arrive.
- You see the train.