working with c5 classes within external scripts

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hi

im working on a updated members area from an old site that adds new fields that are linked into c5 accounts, basic we have added a new table for these extra fields that are linked by c5 user id to pull them for google maps. what im required to do is to have the option from the these new memer edit scripts is add a new user to c5, ive done a manage own account fine using a php block to allow me to update there details and change there password using c5 user classes.

$u = new User();

what im after is the ablity to have an external script attached to my new manage members area that adds new users. so realy i need to figure how to include the core c5 engine to allow me to use the classes

does this make sence?

thanks