A CMS library is an OpenVMS directory containing specially formatted files which CMS uses to operate. You create a library by first creating an OpenVMS directory (with the $ CREATE/DIRECTORY command) and then creating a CMS library in that directory (with the CMS CREATE LIBRARY command). Once you have created a library, it must be reserved exclusively for use by CMS. (1) HELP CMS CREATE LIBRARY tells how to create a new library. (2) HELP CMS CONVERT LIBRARY tells how to convert your V2.n library to V3.0 format. (3) HELP CMS MODIFY LIBRARY tells how to change the attributes of one more libraries. (4) HELP CMS SET LIBRARY identifies one or more existing libraries as your current library list. (5) HELP CMS SET NOLIBRARY removes one or more libraries from the currently set library list. (6) HELP CMS SHOW LIBRARY displays the directory specification of your currently set CMS library or libraries.