A project is saved in a file. The file name is identical to the project name. The first program organization unit created in a new project will automatically be named PLC_PRG. The process begins here (in compliance with the main function in a C program), and other POUs can be accessed from the same point: programs, function blocks and functions.
Once you have defined a Task Configuration, it is no longer necessary to create a program named PLC_PRG.
There are different kinds of objects in a project: POUs, data types, display elements (visualizations) and resources.
The Object organizer contains a list of all the objects in your project.