Telecom allows you to communicate to other computers or bulletin board services via an external modem or a serial device.
This screenshot also shows you some of the common controls.

It is possible to completely change the color palette, however you may only choose four out of the sixteen possible colors due to the Tandy video limitation.

And finally, the help system.

It is also possible, using the “Remove” and “Display” options, to rearrange the desktop items.