A configuration map lineup specifies what configuration of applications a configuration map requires for a platform.

You typically define a configuration map lineup when the applications in the configuration map require different prerequisites for different platforms. For example, a configuration map lineup might specify that a configuration map (MapA) use two required maps:

A required map is simply a configuration map that contains applications that must load before the applications in the related configuration map can load. Thus, for an UNIX system, ReqMapUNIX in the above example must load before the applications in MapA can load.

A configuration map lineup resembles an application lineup in that it can have one or more lineups. Each lineup matches a Smalltalk Boolean expression to a required map. The default lineup expression is true, meaning that the applications in the configuration map are not platform-dependent.