
Explanation/Reference:
* Office On Demand "streams" a temporary copy of an Office 365 Windows applications (Word, PowerPoint, Excel, Publisher and Access) to a Windows PC. A streamed Office 365 Windows application differs from the standard installation of an Office 365 Windows application in two ways:
/A streamed Office 365 Windows Application does not require the person streaming the application have the authority to install software on the computer they are streaming the application to.
/A streamed Office 365 Windows Application does not leave a footprint on the machine it is streamed to.
Once the streamed application is closed, it will not be available for future use; you may however stream the application once again as needed.
* To enable or disable Office on Demand
Go into your SharePoint Online Admin Center, select Settings from the left-side navigation, and then scroll down to the Office on Demand header to enable or disable the functionality.
Note: Microsoft plans to eliminate its Office on Demand feature from Office 365 subscriptions, starting in November 2014.
Reference: Office 365: Office On Demand Guide
http://web.csulb.edu/divisions/aa/academic_technology/thd/student_advantage/365-office-on-demand.html Reference: Enabling Office on Demand in SharePoint Online
http://sharepointyankee.com/2014/04/24/enabling-office-on-demand-in-sharepoint-online/