VMS Help Sys Parameters, GBLSECTIONS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    GBLSECTIONS sets the number of global section descriptors
    allocated in the system header at bootstrap time. Each global
    section requires one descriptor. Each descriptor takes 32 bytes
    of permanently resident memory.

    The default value is sufficient for the images normally installed
    as shared in the system startup command procedures. Once the
    system is running and all global sections are created, you can
    examine the actual requirements with the /GLOBAL qualifier of the
    Install utility and reduce the value of GBLSECTIONS accordingly.
    However, the value of this parameter should not be set too low.
    If you plan to install many user images as shared, or if user
    programs are likely to create many global sections, you must
    increase the value of this parameter.

    If the value of GBLSECTIONS is too small, you receive a message
    from the Install utility at system startup time or whenever
    you install images manually. Note that too large a value for
    GBLSECTIONS wastes physical memory.

    GBLSECTIONS has the AUTOGEN, FEEDBACK, GEN, and MAJOR attributes.