I disagree with that, since the principle of Windows 'X' has been the same for decades: close the application. So shifting the 'x'-function may at most' be an option in the Shareport settings (to change the behaviour conciously), not a standard action. Otherwise you're tampering with the basic priciples of Windows which only riddle the avarage user more.
You're right - X does close the application - and although architecturally, SharePort.exe is an application,
functionally, it is more like a control panel applet.
Think of it this way: when you open the sound mixer or your anti-virus controls from their icon in the notification area (aka system tray) and click X to close, you don't expect your sound to stop working or your anti-virus to shut down - nor do you expect to no longer receive notifications from that program or the icon to disappear from the notification area. You intuitively understand that you're just closing down the
control interface, not terminating the functionality (or the ability to receive future notificaitons). Windows Live Messenger is a great example of an application that by design does not terminate when you hit X - and trust me, Microsoft invests a GREAT DEAL into user experience research.
Because SharePort
must run as a persistent process for the functionality to be available, the X should absolutely NOT shut down the process.
You have to remember - usability is paramount. Just because you and I, who are probably more avid computer users, find it strange that hitting X does not shutdown the application (trust me, it took me a bit to get used to it with Messenger, back when I didn't use Messenger and just wanted the damn system tray icon to go away when I clicked the X), doesn't translate to the experience of the average joe computer user.
They may want the Messenger window to go away from their screen (or the SharePort interface), but they do not want to stop receiving messages from their family (or to not be able to print automatically to their SharePort-connected printer).