UPWB_YS_HANDLER is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Runtime Registry Information for Registration of Handler" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_UPWB_YS_HANDLER TYPE UPWB_YS_HANDLER.
The UPWB_YS_HANDLER table consists of various fields, each holding specific information or linking keys about Runtime Registry Information for Registration of Handler data available in SAP. These include PRIORITY (Priority), COMPONENT (), METHOD (Any String), EVENTTYPE (Type of Handler)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .