COMT_PRVIEWH_KEY 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 "View: History - Key Fields" 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_PRVIEWH_KEY TYPE COMT_PRVIEWH_KEY.
The COMT_PRVIEWH_KEY table consists of various fields, each holding specific information or linking keys about View: History - Key Fields data available in SAP. These include CLIENT (Client), VIEW_GUID (Internal Key of a View), VALID_TO (Valid To (Time Stamp))... 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. .