1    /RAD

       /RAD=n
       /NORAD

    Specifies an additional memory section if you want to specify
    more than one RAD for a single reservation.

    Use /NORAD to add a memory section without specifying a RAD.

2    /SIZE

       /SIZE=size of reserved memory, in MBs

    Specifies the number of megabytes to be deducted from the
    system's fluid page count for this memory-resident global section
    when the VMS$RESERVED_MEMORY.DATA data file is read during system
    initialization.