The data is kept in the very powerful OLAP database TM1 by IBM Planning Analytics, managed and made available to the various front-ends.
With planning analytics for Excel (pax), the user can work in Excel as usual and use all functionalities. The data come and go to the TM1.
Planning Analytics Workspace (PAW) provides a very powerful web interface. There you can publish Excel forms (Websheets) and also direct views on the data cubes (views). Sophisticated data distribution functions can be planned very efficiently.