See MSDN on "The Taskbar"
(User Interface->Windows Shell->Shell Programmer's Guide->Intermediate Shell Techniques->Programming->The Taskbar
...especially:
...which gives some clues. I've never done it but I might be able to give you a hand if you run into something.
(User Interface->Windows Shell->Shell Programmer's Guide->Intermediate Shell Techniques->Programming->The Taskbar
...especially:
It is possible to cover the taskbar by explicitly setting the size of the window rectangle equal to the size of the screen with SetWindowPos. For Windows 2000 systems or later, the window must lack either WS_CAPTION or WS_THICKFRAME, or else the window must be sized so that the client area covers the entire screen. Also particular to those systems, if the taskbar is set to Always On Top, it will remain hidden only while the application is the foreground application.
...which gives some clues. I've never done it but I might be able to give you a hand if you run into something.