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.1. A portable data storage module for simultaneously depicting multiple calendars on a single display comprising:

a portable, hand-held housing including a top face, a bottom face, and a side wall therebetween for defining an interior space;

an input device situated on the top face of the housing and adapted for allowing input of data;
a display situated on the top face of the housing and adapted for depicting data;

memory situated in the interior space of the housing for storing a plurality of calendars each including a plurality of scheduled matters; and

a controller situated in the interior space of the housing and connected between the input device, the display, and the memory, the controller suitable for simultaneously depicting a plurality of the calendars on the display.

A portable data storage module for simultaneously depicting multiple calendars on a single display comprising:

a portable, hand-held housing including a top face, a bottom face, and a side wall therebetween for defining an interior space;

an input device situated on the top face of the housing and adapted for allowing input of data;
a display situated on the top face of the housing and adapted for depicting data;

.2. The portable data storage module as recited in claim 1, wherein the scheduled matters are depicted on the display with each calendar.