Nice topic. But i don't need an invisible program, i want is uncloseable program. We know that windows xp and above have task manager that have process list. In that list we can close any application, especially if we have administrator password. What i want is how to make our application can not be closed by using this process list. I have create event on window close (i forgot the code, but it use window message/WM) it only work if we close it on window list not on process list.

PS: I'm not doing harmfull things with this application, i only create a netcafe billing because my friend can see the password even the password is complex.

Thanks.