Link2SD working issues

I have installed the [Link2SD](https://play.google.com/store/apps/details?id=com.buak.Link2SD) application on my Samsung Galaxy Ace, everything is in place, now I dont understand how it works. I have allotted 1GB of space to my second ext3 partition, I have 2 doubts: 1. Whenever I link my application, those space does not gets deducted from internal memory, I checked in *Settings → Manage Application* 2. When I move the application to SD card, still I have some space occupied in internal memory I don't understand the exact use of Link2SD: if I allotted 1GB of space for the apps, then why my internal space is being used -- and if Link2SD does work like this only, then I would better use force move application using adb shell, which even does not require rooting. Can anyone please clarify my doubts, and let me know how can I use *Link2SD*, so that everything is moved to SD Card and nothing remains in internal memory?