If you want to check all Dynpros belongs to one program, you can use table D020S. D020S is known as SAP Table to store screen sources information. This is available within R/3 SAP systems depending on the version and release level.
To display or maintain this table, use T-code SM30
You can use T-code SE11 to view the fields in table D020S:
It is text table D020T with the key program = sy-repid