constinteger           {MODE values for CONNECTFILE} c 
  bizarre=128,         {for ECCE
  writemask=8_30,
  nowrite=0,
  writetemp=8_10,      {do not update file
  updatenew=8_20,      {create new version (not implemented)
  updateoriginal=8_30, {update existing file (not implemented)
  readmask=6,
  noread=0,
  execonly=2,          {¬
  readonly=4,          { > indistinguishable
  readexec=6,          {/
  lockinstore=1        {do not page out (not implemented)
{NB default mode (mode&(writemask+readmask)=0)
{   is treated as writetemp+readexec