Your Screenplay Pro HD normally gets an IP address using DHCP. This might be a new IP every time you switch on the machine. However, you can also refer to it using its NetBIOS hostname.
Get your Screenplay's current IP address then enter on your local computer:
nbtstat -A <IP address>
You will get the unique NetBIOS hostname of your machine which you can use further on to refer to it e.g. telnet iomega-d713bb3f