COMT_PRWB_USER 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 "User Settings Workbench" 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_COMT_PRWB_USER TYPE COMT_PRWB_USER.
The COMT_PRWB_USER table consists of various fields, each holding specific information or linking keys about User Settings Workbench data available in SAP. These include CLIENT (Client), UNAME (User Name), APPLICATION (Locator Application), LAST_OBJECT (GUID of an Object)... 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. .