Hello,

  thank you very much for your answers,
  i read the linux programmers guide and it helped me a lot,

   i did a first successfull test :-)  but i got errors when i tried
 to use a bigger size for the shared memory (greater than around 3000000),
 what is the origin of the problem ?? is there any limit for the size of
 the shared memory ? is possible to change it ?

   regards,
                 Rafa

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