Well, even the simplified version will be quite long. I have described the entire thing here, but may be it is not sufficient for you to guess.
FYI, I am giving the update gui routine here, which is getting called from the server function as and when it has read some data from the socket.

sub updateGui {

    my $self = shift;
    my $data = shift;
    

    my $hlist    = $self->{jobTree};
    my @cellInfo = split( /\s/, $data );
    my $font     = "{helvetica} -12 bold";

    my $style1 = $self->{displaybaseObj}->getItemStyle(
        $hlist, 'text',
        -foreground => 'black',
        -anchor     => 'nw',
        -background => "$cellInfo[2]",
        -font       => $font
    );

    my $num1     = int( rand(2) ) + 1;
    my $num2     = int( rand(2) ) + 0;
    my $subnode1 = $cellInfo[0] . "." . $num1;
    my $subnode2 = $cellInfo[0] . "." . $num1 . "." . "0" . "." . $num
+2;

    $hlist->itemConfigure(
        $subnode1, 2,
        -text  => "$cellInfo[1]",
        -style => $style1
    );
    $hlist->itemConfigure(
        $subnode2, 2,
        -text  => "$cellInfo[1]",
        -style => $style1
    );

}
[download]

The $data to this routine is like "500 running green" i.e a gui row , some status of that and a colour separated by single space. $hlist is the Tree widget which just a bit extension of the built in HList.pm Tk module.

Let me see , if I can post a very simplified version of it.