It is a tool that allows communication between deafblind people and their partners through the exchange of written and accessible.

It is a program to help deafblind people with hearing loss that does not allow them to understand spoken messages and visually impaired to varying degrees.

Allows the deafblind person, so accessible to and in person visual characteristics, issuing written messages to partners and access to the response of these.

CTO also allows the user deafblind using prerecorded messages in advance to initiate communication or use for it.

It offers the possibility to use the program as an accessible text editor, or for use in other applications or the CTO itself.