While SPK is running, it tells Internet Explorer to stop all unsolicited windows from being downloaded and appearing. Unlike most pop-up killers,

there's no need to download the popup ads;
Your bandwidth is saved for other running browsers!
there's no need to set up for particular websites or keywords;
Very easy to use!
there's no need to wait while a new window appears and disappears;
You won't be disturbed from screen flash!
there's no need of additional option when you open a new window;
SPK only blocks unsolicited pop-up windows while never prevents you to open any new window!