User`s guide

Glossary-6
virtual block Connection or graphical block, for example a Mux block, that has no
algorithmic functionality. Virtual blocks incur no real-time overhead as no code
is generated for them.
work vector Data structures for saving internal states or similar information, accessible to
blocks that may require such work areas. These include state work (
rtDWork),
real work (
rtRWork), integer work (rtIWork), and pointer work (rtPWork)
structures. For example, the Memory block uses a real work element for each
signal.