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Background pages are loaded after your app is installed, after the computer restarts and after Pokki is manually restarted.
If the memory management service finds your background page is using over 200mb of memory it will be unloaded and then re-loaded.
Whereas the window page can rely on the background page’s existence as it is always loaded (well, almost always – see Advanced Example #2 below).
You will note that calls are very similar to Java Script’s eval() function.This effectively means a background page is always loaded.Your app can take advantage of the fact the background is always loaded to pre-load and cache data that will be used by the window.Please see Saving data and Communication between pages for more details.At times it may be useful for the window and background page to communicate and exchange data.