From the introduction section of the Usage Manager guide:
The Application Usage Manager monitors the use of every application on all of your servers, desktops, and laptops. This enables you to: l Enforce corporate standards by identifying non-standard software and software versions in use within your enterprise. l Implement license tracking, giving you the ability to purchase and maintain only those licenses that are required. l Enable OS migration support by prioritizing software distribution based on actual usage. l Use reporting to view the actual use of application resources.
The Usage Manager guide itself is available on your installation media (appusagemgr.pdf) or on HP Software Support online.