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

    ACP_SHARE enables (0)  or disables (1) the creation of a global
    section for the first ACP used, enabling succeeding ACPs to share
    its code. This parameter should be set to 0 when ACP_MULTIPLE is
    on.

    ACP_SHARE is a DYNAMIC parameter.