The DzSoft Perl Editor software's main window will allow you to create your own perl files and to edit the ones you have already saved. 

The DzSoft Perl Editor program's Properties dialog window Display tab will allow the user to customize the look and feel of the editor according to his/her own preferences. 

The DzSoft Perl Editor software's Run dialog will allow one to easily adjust the environment variables simply by entering his/her desired custom into each of the 5 customizable form fields.