Does the first signed on computer copy its information to the cloud?

Does the second computer/pad/cell then download the information from the cloud overwriting the information on the second device even if some of the information is different? 

If you delete a record (eg a bookmark) from the second device how does it then delete it on the first device? What are the keys to the different types of information?

Hi I have answered you questions inline below: Does the first signed on computer copy its information to the cloud? Yes when you first set up the account or when you first add a device to the cloud, if it is not the first time, it will merge with the other data Does the second computer/pad/cell then download the information from the cloud overwriting the information on the second device even if some of the information is different? By default it merges. There is no option to change this. What happens to the information on the second device that is not in the cloud? It will sync at the next sync interval if that data is selected to sync. If you delete a record (eg a bookmark) from the second device how does it then delete it on the first device? What are the keys to the different types of information? It resolved the entry the next time the first and second device syncs. Can you elaborate on the second part of this question?