The 1099-B doesn't tell you if the PLAN itself is qualified - that information has to come from the employer - and it doesn't distinguish, really, between Qualified and Nonqualifed dispositions. (I'd say GENERALLY most employers don't show compensation arising from Qualified dispositions on the W-2, limiting that to only Nonqulifed dispositions, but some posters have reported seeing compensation arising from Qualifying dispositions showing up on their W-2's.)
The employer should tell you about the compensation included in Box 1 of your W-2 over in Box 14, which is pretty much a "memo" or "information" field. Unfortunately that box doesn't allow a lot of space for words of explanation and there's no "standard" abbreviation notations, so you kind of have to figure out what they're talking about in the few letters they enter. So, for example "DQESPP" probably would translate to "compensation included in Box 1 from Disqualifying sales of stock acquired via an ESPP."
