Forwarding to an app

-- [ From: Keath Marx * EMC.Ver #2.5.02 ] --

Greetings,
  Not subscribed to the list so please reply directly.  I am new to procmail
and need it to forward incoming mail to an applications (mlist2html).  How
would I do this?  I need it to pass certain variables depending on the
subject.  I.E. if the subject is Quasar then the command needs to be .
/mlist2html quasar < (message)  Etc.  Thanks in advance!