they are not formally defined by microsoft, so they are free to change with
releases. none of them are meant to be called by client code. most are the
helper functions used by the validators themselves.

probably the only useful function (which ms should doc)  is:

 Page_ClientValidate(validationGroup)

which can be used to call validation on a group to determine if a postback
should be done. it returns true if validation passes.

as always the source is the documentation.

-- bruce (sqlwork.com)