If you want to get a user's list currently in a room with you, just double-click the user's name and you will automatically download their list.

Also you can choose "Get List of files"  from the context or Actions->User  menus.


In this case, the chat will notify you when the list is downloaded and ready:


Once the list is downloaded, click on the list name to view it.


Alternatively, if you have the user in your Contacts, you may select their username, then right click and "get list".  If a user has assigned a specific list to you, you need to use this method to get it.