EH>
  >                                These parameters are
  > PrevAction and PrevHandler. They are pointers. One to a
  > UShort, the other to a pascal procedure.
EH>

  They are so that you can chain back to the original signal handler if
  your handler cannot cope with the signal.  OS/2 returns the address of
  the previous handler function and the previous action code to you.

  > JdeBP <
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