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Once a program is transferred from the
disk into the RAM  chips,  it is ready
to be run.  The program's instructions
are read by the CPU  and  carried out.
Perhaps part of the  RAM  will be used
for a  scratch  pad to hold data as it
is  being  changed.  For  instance, if
you are writing a letter with  a  word
processing  program, that  letter will
exist in the RAM.  If  the  power  was
turned off, the letter  would  be lost
unless you first copy it onto a disk.

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