If you don't know what you are doing I would strongly advise against allowing remote desktop protocol (TCP 3389) in from the net to your trading PC.
BTW, UDP 3389 is not needed.
To the OP, if real money is involved you may want to go beyond the software approaches mentioned and get a full IP-based KVM solution - that will allow you to see what is going on even if the OS has crashed or hung. I've used Avocent products in the past - not cheap but quite good.