/GROUP=n

    Establishes that the reserved memory is for a group global
    section. The value n specifies the UIC group number (in octal) of
    the process that creates the group global section. Only processes
    within the creator's UIC group number are allowed access to the
    global section. For example, if a process with the UIC of [6,100]
    is the creator of the group global section, the group number for
    the /GROUP qualifier is 6.

    You cannot use the /GROUP qualifier with either /SYSGBL or
    /NOGLOBAL_SECTION qualifiers.