I'm looking for a way to add Joomla user to custom table (PrestaShop - same database) - duplicate user on registration. So user will be able to login to Joomla and second script (PrestaShop) using same login information. Any ideas where I should start looking in Joomla files? I know, that custom user plugin will be a better way to achive user duplication, but now I'm looking for temporary hard-coded fix until I'll be able to write a plugin.
(Joomla 1.6)