Once the desired information set or sets have been defined, the next step in the query process is to define the classes that are to be searched. For the View commands, there is a default set of classes that will be searched. For the Find command, the default is to search all classes. If the default set of classes is the desired set, you can begin searching without changing the classes.
If the default set of classes to search is not the desired set of classes to search, then you can change the set of classes by doing one of the following:
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Select All classes on the Find tab. This option expands the search to include all classes for the selected information set or sets.
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Select a predefined set of classes from one of the class lists.
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Explicitly specify the classes to search.
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Select Last search. This option defines the query to only search the classes used in the last search. The set of classes to be searched are shown to the right of Last search.
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Select a named query or specify an interface query from the Query tab to query based on that interface rather than on the selected list of classes.
Selecting a Predefined Class List
A number of predefined class lists are automatically loaded into the meta-schema during
initialization of the Schema Editor. These lists are defined to identify sets of related
classes that contain information that the user might want to search and display. The
predefined class lists are displayed by selecting 
Browse next to the Class list box on the Find tab.
Check the class lists on which to search on the Select Class List dialog box.
Explicitly Specify the Classes to Search
For the ultimate control of what to search, you can specify which classes are to be
searched by select Browse next to Only classes.
In the Select Class List dialog box, the user can choose exactly which classes to search, as seen in the following image.