Library /sys$common/syshlp/sysmanhelp.hlb PARAMETERS, USE, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  SYSMAN> PARAMETERS USE DEFAULT
  SYSMAN> SET STARTUP_P1 "MIN"

      The first command activates the default parameter values that
      are supplied with the operating system. The second command
      sets the STARTUP_P1 system parameter to "minimum." This avoids
      starting all layered products on a system that is not tuned for
      them, which might cause the system to hang.