Hi Shiva
You can do simultaneous buffered waveform acquisition and generation with the 6052E. You'll find useful tutorials and examples on www.ni.com. Here you have some very interesting:
http://zone.ni.com/devzone/conceptd.nsf/webmain/E1060C842FB4FB6D86256802007B90C8?OpenDocument
http://zone.ni.com/devzone/explprog.nsf/6c163603265406328625682a006ed37d/913e26ccf1019bbb862566eb007bb202?OpenDocument
There are some simultaneous AI/AO examples which are shipped with LV too.( At least with LV 6.1)
Luca P.
Application Engineer
National Instruments
Regards,
Luca