Title: Disable/enable taskbar
Taskbar window name is 'Shell_TrayWnd'. Use FindWindow function to find Taskbar handle, and EnableWindow function to disable/enable taskbar.
For example:
var
TaskbarHandle: THandle;
...
procedure TForm1.FormCreate(Sender: TObject);
begin
TaskbarHandle:=FindWindow('Shell_TrayWnd', nil);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
EnableWindow(TaskbarHandle, False);
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
EnableWindow(TaskbarHandle, True);
end;