.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: ![](http://www.litdek.com/g-images/1.png) ![](http://www.litdek.com/g-images/2.png) a portable, hand-held housing including a top face, a bottom face, and a side wall therebetween for defining an interior space; ![](http://www.litdek.com/g-images/3.png) ![](http://www.litdek.com/g-images/1.png) 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; ![](http://www.litdek.com/g-images/4.png) .2. The portable data storage module as recited in claim 1, wherein the scheduled matters are depicted on the display with each calendar. ![](http://www.litdek.com/g-images/2.png)