WordPress.org

Are you sure that this plugin will work on my site?

Obviously no! I've tested it on some Apache and IIS Windows server... I'll be happy if someone will inform me about any problem.

I've installed XYX plugin that alter the login/logout/registration process, will they work well with InsiteLogin?

I hope yes. The mechanics I use is (in theory) fully integrated with standard login, and so any plugin altering wp-login.php can also alter InsiteLogin. I've tested with Register Plus and works very well.

Why require WP 2.5? Will it works with earlier version?

I think it can work, but I've not tested... If someone can test, please report to me any inconvenience; I think this plugin can work with 2.3 versions, but I'm not sure.