Just like how WF uses ID's in the URL, SharePoint does the same thing.
To see a list's ID (GUID), go into the list, select Settings> List
Settings. In the URL you'll find the list ID - Example:
ITG/ProjectManagement/Project%20Governance%20Wiki/InnotasSupport/_layouts/listedit.aspx?List=%7B27FC51A4-1311-47C6-B4D7-FC315E284F81%7D
The bold text is the list ID for a list I have in SharePoint. We don't
use SP online (365), but I believe that you can do what you're seeking
to.