CMS_STR_TSK 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 "Tasks Data (DB Format without MANDT)" 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_CMS_STR_TSK TYPE CMS_STR_TSK.
The CMS_STR_TSK table consists of various fields, each holding specific information or linking keys about Tasks Data (DB Format without MANDT) data available in SAP. These include TASK_GUID (Task GUID: Primary Key for CMS_TSK), TASK_PRIORITY (Task Priroity), TASK_STATUS (Task Status), COMPL_STATUS (Completion Status of a Task)... 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. .