This a question that has often been asked. Some of the previous question/answer threads are:
One community member has even written a whole post about the subject:
Do these previous threads answer your question?
@Carlos Rafael Techera Bouchacourt
Everyone who has a familysearch account can see the information... as it is “one big shared tree” you could collaborate by sharing PID and other info... all changes to a person in the tree are documented and includes the user who made the changes. So basically all the other person needs is a fs account. I hope this helps
Thank you for your feedback. Sorry to ask, what does PID stand for? Thank you again
A PID is a Person IDentification number - others also just call it the ID or the Person's ID (PID). It looks like this: GWD5-G8S (4 characters - a hyphen - 3 characters)