When the teacher clicks the Chat icon the blank Chat window appears.
Using chat discussion to get plenary feedback 1
Once the teacher clicks the Enable icon the chat session becomes active and the window changes to show coloured backgrounds.

If you are conducting a whole class session then click on the A icon at the top left of the Chat window and the whole top section will turn blue.
Using chat discussion to get plenary feedback 2
Simply type your question into the text box at the bottom of the window and then click the Send icon.

Your text will be shown to all the students and they can enter their individual response. As each student responds your chat window will update to display their answer.
Using chat discussion to get plenary feedback 3

You can then do one of the following from the top right of the chat window
Using chat discussion to get plenary feedback 4
1. Save the chat contents as an RTF or TXT file
2. Print the chat contents
3. Clear the chat contents
4. Exit the chat session

See the Sanako instruction video site to see this feature described in action.