Popup Boxes that can be shared between unrelated lua code?

[Seth Burleigh <seth@...>]

I need to write a popup alert box. However, I want to be able to leave
the dialog box open and any new 'alerts' will be written to the popup
alert box, not opening a new one. What will be opening these boxes are
totally separate lua scripts which have no knowledge about eachover,
other than the fact that a popup box could be open. 

Is there any way to do this??? 
Thanks!