registration login adress and third component

-- HikaShop version -- : 2.5.22
-- Joomla version -- : 2.5.22
-- PHP version -- : 5.3.9
-- Browser(s) name and version -- : many

Hi
Many components (CB , Jomsocial ....) manage override joomla registration / login extension .
1) Which extension hikashop manage the registration login process ?
2) Does this occur using Hikashop component or third extension ( plugin ) ?

the aim using joomla for registration/login is that all registration step should be manage by one view ( HKS ? ) but all components ( CB) ll have their custom table update .

regard's