Reasons for not using IFrame?
iframe
Solution
The iframe is a great tool. It enjoys near-universal browser support, it's easy to implement and has a number of useful functions. As with any other HTML element, it can be abused, but wielded intelligently it can play a part in a solid UI.
Some developers might argue to use AJAX instead, and in some situations that may be the more appropriate approach, but AJAX is not a panacea and iframes can be a far simpler implementation which has the same end-result for your users. Do whatever is simplest first, and only change that when you can verify how and why that is not working.
Problem
are there any reasons not to use iframes at all? I currently use it to load a page from a different server (a sign up page - part of a distributed application) to provide a seamless experience. Is using iframes considered bad practice or is its use OK?