MDS$MITROOT:[*...] contains all of the MIT-original shared images,
command procedures, IDL procedures, etc for MDSplus.

    (note: any PPPL-original stuff is put in MDS$PPPLROOT:[*...] )

Updates and full replacements of MDS$MITROOT are applied via a backup
saveset, created on the VMS cluster at MIT and then copied down here:

At MIT:  create the backup saveset on Alpha node DAQA ...
    o Login as GIBNEY
    o Move to [gibney.mdsplus]
    o $ @make_mdsplus_backup

    This creates SCRATCH_DISK:[GIBNEY]MDSPLUS_FULL_yymmdd.BCK

At PPPL:  node Birch, say:
    o Move to PPPL_RES:[mdsplus]
    o $ ftp daqa.psfc.mit.edu
      FTP> login gibney ...
      FTP> cd scratch_disk:[gibney]
      FTP> type backup                 ! <<< NOTE!
      FTP> get MDSPLUS_FULL_yymmdd.BCK *
      FTP> quit

    o Create new directory:
      $ create/dir AUTIL:[MDS$MITROOT_yymmdd.ALPHA]/owner=system
      $ define  XXX  AUTIL:[MDS$MITROOT_yymmdd.ALPHA.]/trans=c

    o $ backup MDSPLUS_FULL_yymmdd.BCK/save XXX:[*...]/log

              --> Watch for "over-quota" messages.  Make sure that
                  all files get copied

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REPLACE MDS$MITROOT on your test VMS node.  Choose a quiet one!

    $ set default mds$root:[sysmgr]
    $ @mds_install  remove
    $ install remove MDSRTLPRV$PROTECT
    $ install remove MDSRTLPRV
    $
    $ define/system/trans=c MDS$MITROOT  AUTIL:[MDS$MITROOT_yymmdd.ALPHA.]
    $ @mdsprvinstall
    $ @mds_install

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Do a test, even a simple one of just mdsOpen and mdsValue:
    $ idl
    IDL> mdsOpen,'dummydata',-1
    IDL> print,mdsValue('xxx_h409:enabled_mask')