Hacking Gmail

Like most desktop applications, Gmail actually allows you to mark a group of items without having to select each one individually (by mark, I mean to put a check in the checkbox next to an e-mail when you are presented with a list of e-mails).With Gmail, if you’d like to select a group of consecutive messages without marking each one separately, you simply need to check the first on in the list, and then hold down the Shift key and check the last one you want to include in
the group of marked messages—the two e-mails you checked and all of the e-mails between them will now be marked. You can use the same method to unmark e-mails and to star or unstar them. Note, however, that this might not work in all browsers.