FRMLS_DIALCTR 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 "RMS-FRM: Dialog Control Structure" 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_FRMLS_DIALCTR TYPE FRMLS_DIALCTR.
The FRMLS_DIALCTR table consists of various fields, each holding specific information or linking keys about RMS-FRM: Dialog Control Structure data available in SAP. These include ACTYPE (Activity category in SAP transaction), PICGRP (Screen group), PANEL (Name of the current screen display), TRTYPE (Transaction type)... 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. .