I need to create a small application that should display graphical elements on top of my desktop without interfering with it. But I don't really know where to turn to.When the application is closed, all the graphical elements it created should be removed. Basically I want to place an overlayed canvas on top of my desktop.Is there any easy way to do this? Where should I look into? xlib?I haven't program in C/C++ since my introductory programming courses at university, more than ten years ago. I still remember most of it, but my experience is limited.