Just for your information, it is possible to run Ensign on a Pac PowerBook, easy.  I have a G4 with 512mb of ram and it works smoothly.  All I did was install a copy of Microsoft Virtual PC, which installs a windowed session of Windows XPP.  I then installed Ensign and Interactive Brokers (for trading and the data feed) directly into the XPP window.   As you can see, I have several other Mac programs running at the same time, and all run well together.  The only problem is the charts are a bit slow to move around and resize, due to the 256mb of memory that is alloted to the Windows XP window, but data throughput is same as on my PC and charts update exactly the same (I ran them side by side and compared).

Here is a screen shot: