you might have a look at DM2:http://dm2.sourceforge.net/
it does things similar to that and it's open source so you could extend it to do what you want.
thank you for the link.
I already used DM2 before! (I'm just forgot)
But it is not exactly that I need. Maybe I need a plugin for DM2? But I prefer to have a dll which I can just register and I do not need any tray-icon and .exe processes in the memory. They are absolutely superfluous for my idea.
You can look on my idea for new OS at http://wep.dcmembers.com/interface.html
So, I meant that I want to have similar list of the already opened applications in the dropdown context menu of the (any) window's header for the MS Windows OS.
Many programs can include to this menu items and submenu, but all of them only for command to set windows' transparency, "always ontop" status, etc, move to next virtual desktop, etc.
I never made plugins before. And I never made dll. But I prefer to have dll for this idea.