The phantom-reset BASIC program resets the specified phantom lines to available status. If a UNIX process for a phantom is gone (PID 0), it recreates the process and ensures that the port on the D3 side is available to handle the next request.
The psh BASIC program executes a UNIX command and captures the results in a D3 item. This command is an alternative to the ! command, which allows capturing the result of the UNIX command into a D3 item.