How to display User Mapping for offline databases?

When I use the GUI (SSMS) to review the User Mapping, where the Login has mapping to a database that is offline (*or otherwise not available*) I get the message below and it only displays Mapping for databases that are online. > One or more databases are inaccessible and will not be displayed in list All the details should actually be in the Master DB, there should be something I can run that will show me what the full User Mapping is. How can I display User Mapping for offline databases?