Hiding the taskbar

[Phenom]

How can I hide the taskbar and expand a window over it, and after the the window has closed, restore it?

I searched MSDN about it and didnt find anything useful.

[C_ntua]

Scenario: user tries to close unwanted program. The program hides the taskbar and inserts another copy taskbar on top which is identical except it doesn't list the unwanted program.
Should we help on that scenario: No

I would hope that taskbar has some sort of security but maybe not.

Just being careful here, you can specify what you want to achieve so you can convince people to help you.

[GReaper]

Turning to fullscreen through DEVMODE should apply to your needs i guess.

[Phenom]

Scenario: user tries to close unwanted program. The program hides the taskbar and inserts another copy taskbar on top which is identical except it doesn't list the unwanted program.
Should we help on that scenario: No

I would hope that taskbar has some sort of security but maybe not.

Just being careful here, you can specify what you want to achieve so you can convince people to help you.

That's a very interesting possibility. However, my application is an OpenGL game. I guess i'll use fullscreen mode.