doorhanger

The law prohibits you from stuffing your materials into mailboxes, but most communities do not legally frown on doorhangers. These low-priced marketing weapons can do a variety of jobs for you: entice people into your store, tempt them into ordering your product, motivate them to call you for more information, […]

I can basically do whatever I want in Gmail without that hidden doorhanger icon disappearing. Also, if a user simply uses the post-login page as a launching pad for opening links in new tabs or windows, then the doorhanger still remains in its hidden state.