[sp332]

Google Chrome has added an option lately to keep running after you close the browser window. The option is called "Continue running background apps when Google Chrome is closed." If you click the wrench icon, there would be an option to View Background Pages.

[yehanyin]

@sp332 Thanks for the info. Yup, if you install the offline Gmail, it will still check in the background when Chrome is closed. This background feature is only available to Chrome apps or extensions but not to the web pages.