Desktop users of Gmail have been able to login into multiple accounts simultaneously for some time--mobile users can now do it, also. Accessing multiple accounts is as easy as tapping the new account switcher button at the bottom of mobile Gmail's browser interface. That will display a pop-up menu that gives you the option of switching between accounts or signing in to all accounts simultaneously.

"Of course, if you don't already have multiple accounts enabled, you will need to enable it first by visiting your account settings and selecting the box that allows you to access multiple Google accounts in the same browser," Juli Clover in the PadGadget blog.

If you do use multiple accounts, you might want to create a bookmark that lives on the application screen of your device for each account. Not all devices support this feature, but iOS phones and tablets, which use the Safari browser, do. On those devices, while Gmail is in your browser window, tap the bookmark icon beside the address bar and from the pop-up menu that appears, choose "Add to Home Screen."

When you're on vacation or need to generate some other kind of message to be sent automatically to anyone who sends a message to one of your Gmail accounts, you can do it through a set-up menu accessible from the toolbar at the top of the mail program's interface.