this is 7uu_fig5

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                       ILLUSTRATION                     

GO

  Background processing is the ability to

  run a job unattended.  Several jobs may be run at

  once in the background, however only one in the

  foreground.  Note processes B1, B2 and F1.

       FOREGROUND    |       BACKGROUND

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 B1

 B2

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 F1

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 After the first foreground process is finished, background

 processes B3 and B4 are started:

 B3

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 B4

 . . . and then the foreground process F2 is begun.

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 F2

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 Notice the asynchronous termination of the processes.