I use Kontakt2 in stand alone mode on a second computer. Does Native Instruments' Acoustik Piano work inside of Kontakt2? Does it have to work on its own? How would I use it on the same computer with K2 if I want to use the piano along side other samples loaded inside of K2?
Yes, Akoustic Piano patches work perfectly in K2 and come with a performance view interface (introduced in v2.1) which allows control of reverb length and type, resonance, noise, detail, position etc as found in Akoustic Piano's own interface. I'm not sure that I understand your 3rd question but I hope the above helps.