Taskbar icon for settings and check if not already open

[tripkip]

If you open NPVR settings then switch to another window, you can't switch back to the settings window using alt+tab.
Please make it a proper window/form so that it's visible in the task bar and you can alt+tab to it.
In addition I think mistakes can be avoided making sure you can't open two settings windows, so if the user asks to open the settings form then the settings from that is already open should be made active and not open a new instance.