XRPS uses frames to subdivide the viewer window. This frame environment is invoked as soon as a PI has successfully entered their personal information and is registered as a user. Once done, the ''Proposal details'' page is loaded and the PI can start introducing the details on the planned observations. As illustrated in Fig. 4, there are in total four frames.
The top frame just displays which software application is being used. The other frames are described briefly in the following subsections.