Investment information is often downloaded from clearing firms, investment managers, or custodians of brokerage accounts. These downloads are special programs maintained inside of Advisors Assistant.
If you want to list all of the accounts downloaded from a particular source, you can select that source on the Investment Selection Reports by clicking on the Selection Reports Icon on the Sidebar Menu.
Examples of Download Sources are:
DST Fan Mail
DAZL
Pershing
Fidelity
Charles Schwab
Trust Company of America
and others...