can we add a hook function to userplus module ?

Hi,

I am trying to read an xml file from some external source and will create an array of elements to pass it to this module functions to check the username, email valid accounts and insert them into the database.

can we call any hook functions for this module so that i can pass an array of user information(user,email,password, role etc.) and modify this module to save users in the database ?

I appreciate any help on this.

Thanks