The GUI Library Event Structure (IT_EVENT) 

The most important structure in the GUI Library is the event structure (It_Event). It represents a single R/3 screen.

The GUI Library stores in it a DYNP (screen) event, which is a packet of information going to or from the R/3 application server. This could be a description of a dialog, a screen, messages, or menu information. The event structure encapsulates the union of all this information.

The client application can retrieve information from the event structure, or it can place information in that structure.

The event structure points to other GUI Library structures that contain more detailed information on the contents of the R/3 screen.

For detailed information on the event structure see the reference section for It_Event.