System.cursor_record is a system variable, that represents the number of the record where the cursor is located at any given time, for example, say you have a block with 5 data records (tabular). If you click on any item of the first record, the cursor_record system variable’s value would be ‘1’. If you press the down arrow key to move to the next record, system.cursor_record would return ‘2’, and if you go to the last record in your tabular block, in this case system.cursor_record would return ‘5’.