Integrates the AWeber contact registration script into your WordPress user registration process.
No. The user will still receive a confirmation email from AWeber confirming their intent to register for your mailings.
No. Deactivating the plugin through the WordPress Plugin menu will trigger a built in 'clean-up' function that will uninstall the plugin. If you wish to turn off the plugin temporarily, you can use the built in setting found in the 'AWeber Integration' menu.
Probably not. The Registered Users section allows you to see which of your members elected to register with your AWeber account when they signed up with your website. However, since AWeber a lso sends a confirmation email before submitting the user's information, there is a chance they might not have signed up, thus creating an inconsistency between your AWeber control panel, and WordPress users screen. This feature is intended to give you an idea of how many users have elected to register without having to go to AWeber to find out.