Respond multiple times using the same computer

The actual functionnality is implemented as:
"With this workaround it will be possible to respond multiple times to the same survey. Normally there will be a message saying that the computer already received the answers. To prevent this you have to add the following code to the URL that leads to the survey "&newtest=Y"."

In case we hire an employee who will call 50 customers and will enter all answers into the survey, the employee will have to write 50 times the "&newtest=Y" into the address bar and remember the current number Y for each call. This can be quite complicated for some unexperimented users.

We wants the employees to have invitation because we want to retrace the number of customers each employee call.

Because one person was in some surveys, I made a menu of surveys to enable the individual to choose which surveys done and so many emails do not arrive as surveys have to do. The only thing that prevents it reaches the user key