To make the default Joomla forms more secure, and safe from spammers, you can add a captcha to your Joomla site. This tutorial shows you how to do just that.
When writing a Joomla module or component, you can access the database with the JDatabase option.
Should you have a module installed that locks you out of your back office (for instance the IP block module), you can disable this in the Joomla database.
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