This siddur is an Instruction manual for the Shabbat and Havdalah modules on the jOS (The Jewish Operating System). The manual contains a series of "apps." Each app is designed to perform a specific psychological, intellectual, physical, or spiritual function. These apps are best run in a communal setting, but individuals and families can certainly run them at home. Each entry in this manual contains a statement of the function the particular app is meant to fill and the specifics of how it is run.