You can use several directive clauses to control the data scope attributes of variables for the duration of the construct in which you specify them. If you do not specify a data scope attribute clause on a directive, the default is SHARED for those variables affected by the directive.
Each of the data scope attribute clauses accepts a list, which is a comma-separated list of named variables or named common blocks that are accessible in the scoping unit. When you specify named common blocks, they must appear between slashes ( /name/ ).
Not all of the clauses are allowed on all directives, but the directives to which each clause applies are listed in the clause descriptions.
The data scope attribute clauses are: