Library /sys$common/syshlp/dbg$help.hlb DEBUG, Language Support, CC, Static and Nonstatic Variables  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Variables of the following storage classes are allocated
    statically: static, globaldef, globalref, and extern.

    Variables of the following storage classes are allocated
    nonstatically (on the stack or in registers): auto and register.
    Such variables can be accessed only when their defining routine
    is active (on the call stack).