What you do, is establish an Internet connection between the 2 devices with TeamViewer and then one person gets into & takes control of the computer of the other. Afterwards, you open up Notepad, for example, and then the 2 of you proceed to chat in the open .txt . When you are done, you simply don't save the file and that's it.
You conversation is not saved to be seen by anybody, provided, of course, that no-one's computer's been hacked beforehand.
Edited by Just_One_Question, 01 April 2017 - 08:19 AM.
Moved from Gen Sec to Tips/Tricks - Hamluis.