I am interest to your product and wonder if I understand the use of this product correctly.

I have 4 computers and I am looking to: Sync selected folders to all 4 computers. When one computer make changes to the file/folder, all 4 computers will be updated instantly. Am I right?

If that is the case, what happens when two computers are doing some changes to one file the same time?

First of all this is Resilio Connect Q&A. With questions about Resilio Sync (which is a different product) you can always contact Resilio Sync support or use Sync forum at http://forum.resilio.com or check Resilio Sync Help Center.

But anyway I can answer your questions:

I have 4 computers and I am looking to: Sync selected folders to all 4 computers. When one computer make changes to the file/folder, all 4 computers will be updated instantly. Am I right?

• Yes, you're right and you need to use a "Read & Write" folder for that. Read this article to learn more.

If that is the case, what happens when two computers are doing some changes to one file the same time?

• Sync will synchronize the changes in chronological order because it's not possible that these changes were made at exactly the same time. But actually there can be several possible cases and all of them are described here.