automatically complete fields on the form

Is there any possibility to do the "machine" (or boot or somthing like that) that will automatically complete fields on the form (for example, the website, the program is running on the desktop, etc. ..) - I would like to select the area where and what to write, and which button to press. The application that I want to communicate, unfortunately, does not provide the API: (

The process looks like this:
1. presses the "Edit" button
2. fill the Boxes
3. press the "Save" button

Thanks!

So you want to remote control another application? Which application in which environment?