Accessibility in a Professional Form

How would I go about enabling a form that is created in Professional, to allow multiple users of Adobe Reader to make multiple changes to the form and save to a computer each time it is edited?

Here is my problem...

I have created a form using Adobe Professional. This particular form will have multiple users. As of right now, I have enabled the Typewriter tool, so that someone using Adobe Reader can edit the form. However, in doing that it only allows you to open the form one time using the typewriter tool, and then it can not be modified again.

I need to be able to make the form usable for up to 7 different users, multiple times.

Is this possible?