As a result of the characteristics described in Section 20.1.2, multimedia
applications often require levels of service from the operating system that differ
from the requirements of traditional applications, such as word processors,
compilers, and spreadsheets. Timing and rate requirements are perhaps the
issues of foremost concern, as the playback of audio and video data demands
that the data be delivered within a certain deadline and at a continuous,
fixed rate. Traditional applications typically do not have such time and rate
constraints.