Hi Elksman,
You should search this forum for Mattias Henningson's threads on the 3GB switch. I think most of your questions will have answers here. You can also contact Mattias directly at www.musikbanken.se , or look up his article in the June/July 2006 issue of virtual instruments (www.virtualinstrumentsmag.com).
You'll need to make a simple edit to your boot.ini file to boot up with the switch active. Mattias also has a small app you can download that checks the LAA status of any exe your using, and can set the necessary header bit.
Several of us have used this material with good results.
Best of luck.
Regards,
Peregrine