hi,
   A text file has been formatted ,how to read/write form/into certain place in a text file.
For example,read form letter 5 to 10 in line 4 ,and after some procedure ,write into the same place.
  Another question is that if a user has opened the file to read and write ,what will happen if another one will open and write the same file?
  Thank you in advance.
 
Leon
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