a common method of creating interactive content. It is slowly being outmoded by newer technologies, although it is still in very widespread use and is worth learning.
concerning "Lock-Free" and "Wait-Free" algorithms and data structures. These techniques allow concurrent update of shared data structures without resorting to critical sections protected by operating system managed locks.
CSS allows you to create attractive navigation that, in reality, is no more than text -- text that can be marked up in such a way as to ensure that it's both accessible and understandable, By Rachel Andrew