Adding a button to next steps?

After a sales is completed can (is it possible) to do the following?
1) Add a button to the "Next Steps" page. This button will trigger a web page/script.
2) Get the current sale?
Thanks
Tags:
After a sales is completed can (is it possible) to do the following?
1) Add a button to the "Next Steps" page. This button will trigger a web page/script.
2) Get the current sale?
Thanks