Close a window instead of minimizing it!

[ExSanity]

I'm looking for a C function that closes a window i've tried CloseWindow(HWND) and i'm unsure of how i'd aim ExitProcess() at a specific window. all that CLoseWindow() does is minimize is there a function to like fully exit the window?

i want to close a specific window not a whole process eg

HWND wind;
char winanme[256];
wind = GetForeGroundWindow();
GetWindowTextA(wind, windanme, 256);
//Check if they have a window for New Tabe eg. Google
if (strstr(windanme, "New Tab") != NULL) {
printf("You can't make new tabs!");
CloseWindow(wind); // <- Here is where something to close would be. 
}

[integralfx]

You can try SendMessage() with WM_CLOSE.
https://msdn.microsoft.com/en-us/library/windows/desktop/ms644950(v=vs.85).aspx
https://msdn.microsoft.com/en-us/library/windows/desktop/ms632617(v=vs.85).aspx