Referers

"Referrers" is the feature that denies access to you Form Processor Pro from domains that is not listed. This feature is optional. If it is set up, form can be submitted only from specified domains.

Example:

referers = www.yourdomain.com, localhost, web-site-scripts.com

referers = www.yourdomain.com

Referrers specifies for each form separately. You can set "localhost" if form is located on the same server as Form Processor Pro is.