Getting more questions on simulations as more of you are running in to them. We call simulations performance-based testing (PBT). The reason for this is that the acronym for simulations would just be S, and that is not in keeping with Microsoft's policies of over acronizing as much as possible. PBT, though still fairly short, is less disappointingly succinct and has a nice rhyme-y feel to it*.
Performance-based testing (PBT) in Microsoft Certification exams
Performance-based items are exam questions in which the tester must perform a task in a simulated version of the technology, rather than answering a finite-result style question (like multiple choice or drag and drop). As you all know, PB means a brain-dump user with no experience on the technology can't waltz in and cheat their way to a "pass," you have to be able to get around the software hands-on to get something done.
PB is only in some exams at the moment (a few 'new gen' exams and a handful of Windows Server 2003 exams); there are more coming. I know the strategy team has an eye to getting PB items in to many (all?!?) key MCTS exams, that would be amazing. No exams are all PB, there will be other more traditional item types, too.
In case you have run into PB in the past, you should know that scoring for PB items in new generation exams (e.g. for MCTS exams rather than MCP exams) is different than how it has worked before. Here is a little info on what to expect.
Scoring new generation exams with a PB component
*It makes me think of Bel Biv Devoe (BBD). Never trust a big butt and a smile.