Got it finally:
Do not write:
[CODE]enable :sessions[/CODE]
Write:
[CODE]use Rack::Session::Pool[/CODE] instead.

:)

First show effort in code for the project, then ask for different issues to be solved. Building such an application really takes time. Start to code it then ask :) where you get stuck.

Very simple. Just loop through the processes list and check the name of the current process:
[CODE]
//don't forget: using System.Diagnostics;
try
{
Process[] p = Process.GetProcesses();//system processes in an array
for (int i = 0; i < p.Length; i++)
{

                if (p[i].ProcessName == "calc")//checkcurrent process name
                {
                    //we got it
                    MessageBox.Show("Calculator process found - we will kill it after you press ok");
                    p[i].Kill();//this is the process
                }
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }

[/CODE]
Their name does not contain the *.exe extension. Good luck :).
Clawsy.

Hi I'm writing a client/server remote viewer application where screenshots of the desktop are sent across the network over a socket. I'd like to reduce the size of the transfer by getting [I]the difference between the two images and then sending the difference[/I]. The difference would be at least a rectangle, no? So I need to locate where the change is and send only the "update rectangle" to the client.
[B]How can I do that?[/B] I need performance... (can't loop through pixels... too much time consuming)

commented: very helpful thread!!! +1