Two-factor authentication and more access control
Problem
You want to confirm that the respondent is the intended target for the questionnaire.
Solution
Use the "2FA" pound instruction.
Discussion
When the 2FA pound instruction exists and has been validated by compilation, CallWeb allows response into the questionnaire only once a two-factor authentication cookie has been set. This is done by entering a randomly generated code in the CallWeb script; the code is generated by CallWeb and sent to the respondent's email address. Let's see the details starting with the syntax of # 2FA.
Here is a working example.