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Timing functions
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The following timing functions allow to compute the number of seconds elapsed since a given moment. They are generally used to compute the response time of a program.

1. TimerStart
Use subprocedure timerStart to start computing the elapsed time.
 *   Set timer for calculating execution time
C                   callp     TimerStart()                  

1. TimerElapsed
Use subprocedure timerElapsed to receive the number of seconds elapsed since the last timerStart.
 * Program timing variable
D sec             s             15p 6
C                   eval      sec = TimerElapsed()
C                   callp     updhtmlvar('runtime':%editc(sec:'N'))
C                   callp     wrtsection('runtime')