NID.cbSize = sizeof(NID); // Size of the structure duh :)

NID.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON1));
// The icon that will be shown in the systray.

NID.uCallbackMessage = WM_USER + 1; // Our user defined message.
// (Windows will send us messages when user pressed on our icon)

NID.hWnd = hWnd;
// Handle to the window that will receive the notifications.

NID.uID = WM_USER + 2; // Icon ID in systray...

strcpy(NID.szTip, "System Tray Icon[QSoft]"); // The tooltip string.

NID.uFlags = NIF_TIP | NIF_ICON | NIF_MESSAGE;

// We say our struct has an Icon, a ToolTip
// and we want to get notifications.


// Now we need to "ADD" our icon too..
Shell_NotifyIcon(NIM_ADD, &NID);

// Now let's change some variable in the struct while your application

// is running, for instance let's change the icon and tooltip:
NID.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON2));

strcpy(NID.szTip, "MODIFIED System Tray Icon[QSoft]");

// BTW-when you MODIFY it means that the other variables were set before!
Shell_NotifyIcon(NIM_MODIFY, &NID);

// Don't forget to delete it when you close your application!
Shell_NotifyIcon(NIM_DELETE, &NID);