One of the features of SelectSurvey.NET is restricting to an IP address range.
So, lets say you need to restrict the survey to one department in your company.
The easiest way to do this is by adding an IP address restriction.
On the access tab click "IP address Restriction"
There is a handy online tool that can help you determine your IP address range.
Enter your IP address, subnet mask and voila - the tool will generate your Host Address Range - which you will enter into the Ip address restriction range box in SelectSurvey.
If you need assistance, email email@example.com.