Stub-

 A dummy procedure used when linking a program with a run-time library. The stub routine need not contain any code and is only present to prevent “undefined label” errors at link time.

 Driver-

- A driver is software that works to communicate between an operating system and a peripheral. Think of it as a translator. If you use a crappy driver, your OS won’t understand your video card and may become unstable and crash. Hardware manufacturers constantly update drivers to make them faster and more stable. Operating systems typically come with a set of drivers, but peripherals newer than your operating system typically require new drivers which must be installed via CD-ROM, floppy, or downloaded from the Web.

Module-

An independent piece of {software} which forms part of one or more larger {programs}.  Different languages have different concepts of a module but there are several common ideas. Modules are usually compiled seperately (in compiled languages) and provide an {abstraction} or information hiding mechanism so that a module’s implementation can be changed without requiring any change to other modules.  In this respect they are similar to {objects} in an {object-oriented language}, though a module may contain many {procedures} and/or {functions} which would correspond to many objects. A module often has its own {name space} for {identifiers} so the same identifier may be used to mean different things in different modules. [Difference from {package}?]. 2. An independent assembly of electronic components with some distinct function, e.g. a RAM module consisting of several RAM chips mounted on a small circuit board. (1997-10-27)