Close All Open GUIs?

[baseman101]

I work on a server, but there is a problem I have where I need to close all open GUIs. How would I go around doing so? Thanks. Example:

PHP Code:

//#CLIENTSIDE
Window1.destroy();
Window2.destroy();
Window3.destroy(); 


=>

PHP Code:

//#CLIENTSIDE
for(temp.windows : allopenwindows) {
  temp.windows.destroy();
}