$THISPNT

 The pointer to the location in BDAT (see DATA_BUFFER) of the
 data  of  the  current  event  being  read  out is stored in
 $THISPNT.  Obviously, this value must be updated every  time
 subroutine Event is called.



 $THIS_EV

 This location is used as an internal counter of event number
 by  the  SSP.  Since the master writes the event number each
 time it gives the command EVENT, it is  useful  to  have  an
 internal counter in each SSP to check that the event numbers
 are  consecutive.   In  this  way,  missing  events  can  be


 detected and counted ( in $MISSEV).



 $TOT_EVNTS

 This location is used to count the  number  of  events  that
 have been collected during the run.



 $NEVBAD

 This location is used to count the number of bad events that
 have occurred during the run.  The definition of a bad event
 is SSP_dependent; for example it may be defined as any event
 that contains an error bank.



 $MISSEV

 An internal event counter ($THIS_EV) is used  to  count  the
 events  for  comparison  with the value $PR_EVENT written by
 the master.  If an event is discovered to  be  missing,  the
 counter $MISSEV is incremented.



 $OVERFLOW

 If an event is cut short because $MAX_VAR has been  exceeded
 for  the  variable part of the event, the location $OVERFLOW
 will be incremented.



 $UNDERFLOW

 If the variable part of an event is less than $MIN_VAR,  the
 location $OVERFLOW will be incremented.

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