Application Programming Interfaces and UI modifications for existing applications are used to implement efficient methods for taking content offline with full synchronization, incremental synchronization, in the case of document libraries per-folder synchronization, and the like. The handle assembly includes two transverse bars received in the sheet of fabric and two upright bars which are removably connected to the transverse bars via connection members connected to the transverse bars from outside of the sheet of fabric. An auxiliary inflatable chamber 5 defined with respect to a main inflatable chamber 3 is obtained by sewing the air bag body by a substantially one sewing line using a multi-thread chain stitch method or the like. The frame carries furthermore a second pair of roller means adapted to received the sheet from the first pair of roller means and to guide the sheet through the outlet area and back to the printer. The power transmission mechanism includes four simple planetary gears, three connection members interconnecting two of the rotating members of the planetary gears, three clutches selectively connectable between two of the rotating members, and four brakes each operable to hold selectively against rotation one of the rotating members.