My point of sale software Kassa uses a second monitor to display a client receipt screen.
I am using two main screens for that. The client screen is full screen.
(linux Mint 17.3 64 bit KDE flavour)

void DoMain()
{
	KassaAppWindow app(&session);
	One<KassaClientScreen> clientscreen;
#ifdef PLATFORM_LINUX
	app.OpenMain();
#endif
	if (KassaSettings::UseClientScreen())
	{
		clientscreen.Create();
#ifdef PLATFORM_LINUX
		clientscreen->OpenMain();
#endif
	}
	Ctrl::EventLoop();
}

The above works both on Linux and Windows, however on Linux the client screen also shows on the task bar. That creates confusion and not useful for a full screen display. Is there a way to not show it on the task bar? Note that on Linux I need to Call OpenMain() on the client screen or it won't show at all. On Windows calling OpenMain will freeze the program.