how i can create a transparent form an draw on it?

i want to create a application like this link : http://www.mediafire.com/?u8uj5cxcw565a36

is there anyone who has a code demo of a similar programme can help me ?

thanks !

Up ... help me :(

Maybe attach some screenshots instead of something .zip-ed, for convenient access.

sorry . this is a program image.
http://www.qtcentre.org/attachment.p...&thumb=1&stc=1

Isn't it just manipulating the desktop wallpaper?

it is almost bare and always displayed higher than other programmes.

You could do it in Qt (create a widget covering the whole screen, make it translucent and paint your stuff) but the problem will be handling input events (your widget would steal all the mouse events from the screen if you don't explicitly forward them back to the desktop manager) so I think it's easier to do it by calling the native API directly.