sub send { 
    my $CLASS_HPLOO ;
    $CLASS_HPLOO = $this if defined $this ;
    my $this = UNIVERSAL::isa($_[0],'UNIVERSAL') ? shift : $CLASS_HPLOO ;
    my $class = ref($this) || __PACKAGE__ ;
    $CLASS_HPLOO = undef ;
    my $cmd = shift(@_) ;
    
    $cmd =~ s/\r\n?/\n/gs ;
    $cmd .= "\n" if $cmd !~ /\n$/ ;
    $cmd =~ s/\n/\r\n/gs ;
    
    while ( $this->is_blocked ) { sleep(1) ;}
    
    my $n = $this->read_processR ;
    $n = 1 if $n eq '0' || $n eq '' ;
    
    my $file = "$this->{LOG_DIR}/input.$n.r" ;
    
    while( -e $file || -e "$file._" ) {
      ++$n ;
      $file = "$this->{LOG_DIR}/input.$n.r" ;
    }

    open (my $fh,">$file._") ;
    print $fh "$cmd\n" ;
    close ($fh) ;
    
    chmod(0777 , "$file._") ;
    
    $this->{OUTPUT_R_POS} = -s $this->{OUTPUT_R} ;
    
    rename("$file._" , $file) ;
    
    my $has_quit = 1 if $cmd =~ /^\s*(?:q|quit)\s*\(.*?\)\s*$/s ;
    
    ##print "CMD[$n]$has_quit>> $cmd\n" ;
    
    my $status = 1 ;
    my $delay = 0.02 ;
    
    my ($x,$xx) ;
    while( (!$has_quit || $this->{STOPING} == 1) && -e $file && $this->is_started( !$this->{STOPING} ) ) {
      ++$x ;
      ##print "sleep $file\n" ;
      select(undef,undef,undef,$delay) ;
      if ( $x == 20 ) {
        my (undef , $data) = $this->read_processR ;
        if ( $data =~ /\s$n\s+\.\.\.\s+\// ) { last ;}
        $x = 0 ;
        ++$xx ;
        $delay = 0.5 ;
      }
      if ( $xx > 5 ) { $status = undef ;} ## xx > 5 = x > 50
    }
    
    if ( $has_quit && !$this->{STOPING} ) { $this->stop(1) ;}

    return $status ;
  }