Form Tools offers an optional API (Application Programming Interface) for programmers wanting to perform
various low-level tasks. The API contains methods for things such as
submitting form submissions
via PHP code rather than POSTing the information to process.php, accessing and display Form Tools
data in your own webpages, managing client accounts via code rather than the Form Tools interface and other such
helpful functionality.
The documentation is pretty exhaustive, so you may want to start there, or with one of the following tutorials.