The purpose of this plugin is two-fold:
The treeview on the left contains all the accounts found in your AO folder with sub-nodes for each toon on that account. (If you only see numbers you need to log on that toon whila AOIA is running so it can detect the name of the toon.)
Selecting a node in the treeview will update the listview on the right with all items currently in the playershop log for that account or toon.
If a sale takes place on the toon you are playing, a popup message will appear in the system tray with information about the transaction the next time you zone.