Does anyone knows a function that if a Interface Windows is already open, don't open it again?

I'll explain. If you open a Interface Windows, go back to the menu and open it again, it will open 2 windows.

function OnEvent_MenuClicked(MenuId){
if(MenuId=="123" && blah != true){
//open window
blah = true
}
}

i think that shoutd do it for you

Declare the Window as a global variable and then if the window is open the variable shall return true else false. So

code:

---

var Wnd;//Declaring as global variable
/* Event */
if(!Wnd){
/* Open Window/*
}

---

Thanks NanaFreak and Felu, I got it working with Felu method.

I also added an OnWindowIDEvent_Destroyed() { Wnd = null; }

or it doesn't work when you actually close the window lol