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    ComInputS()

         Extracts a string from the comunications buffer (input str)

    Syntax:

         ComInputS( @cBuffer, nMaxChars ) -> nChars

         cBuffer   : The buffer where the string must be placed
         nMaxChars : The maximun number of chars to read

    Description:

         Receives a string from the comunications buffer.

         ComInputS() brings up to date the internal pointers to the reception
         buffer to point to the next value.

    Return:

         The number of chars received on the port or 0 if there's
         no available byte or the manager isn't active.

    Example:

         cBuffer := Space( 1024 )
         If comInputS( @cSpace, 1024 ) == 1024
           ? "Read Ok"
         EndIf