The present invention provides a method and system for communicating via a handheld device to Internet applications such as customer relationship management applications. Automatically generated user information, such as an electronic mail (e-mail) address, containing a certification key is used to authenticate a mobile user's access to Internet applications. Access from mobile devices, such as personal data assistants, is possible because no password is required to log in. Other security measures may be used in conjunction with providing user information to ensure access only to authorized users.