Apple Inc. Toyota ITC UCLA UCLA This document describes the implementation of Apple Inc.'s Back to My Mac (BTMM) service. BTMM provides network connectivity between devices so that a user can perform file sharing and screen sharing among multiple computers at home, at work, or on the road. The implementation of BTMM addresses the issues of single sign-on authentication, secure data communication, service discovery, and end-to-end connectivity in the face of Network Address Translators (NATs) and mobility of devices. This document is not an Internet Standards Track specification; it is published for informational purposes.