12.1 DECfax
  If SysWorks is installed at the Turnkey level or at the System
  level and overnight processing is enabled, it will manage
  the cleanup of the DECfax database in place of the de-
  fault DFX$CLEANER procedure provided with DECfax.
  To enable the correct operation of overnight processing it is
  necessary to edit the following DECfax startup command
  procedure to stop submission of the DFX$CLEANER job:

  SYS$STARTUP:DFX$START_COMPONENTS.COM

  Normally this command procedure starts various DECfax
  components and then submits the DFX$CLEANER job.
  Placing the DCL command line $ exit after the last DECfax
  manager utility and before the use of the lexical f$getqui(...)
  will stop the command procedure from submitting the
  DFX$CLEANER job.