For login screens, this is the problem that the Secure Attention Key (http://en.wikipedia.org/wiki/Secure_attention_key http://en.wikipedia.org/wiki/Secure_atte

For login screens, this is the problem that the Secure Attention Key (http://en.wikipedia.org/wiki/Secure_attention_key http://en.wikipedia.org/wiki/Secure_attention_key) was intended to solve. IMO this is why the constant pushing of the browser as a platform is more trouble than it's worth. Everything that your OS does now will be re-invented (badly, several times) in one or more of the different web-browsers, lost, found, queried in triplicate, standardised before finally being recycled as firelighter when the next "paradigm shift" takes over.