There are a number of tasks you typically carry out on your project, such as loading it, creating a saved state, debugging it, etc. Good practice on large projects is to define small files that hold the commands to execute such a task, name this file after the task and give it a file extension that makes starting easy (see section 126.96.36.199). The task load is generally central to these tasks. Here is a tentative list:
load.plin silent-mode, and calls one of the starting predicates from
load.pland calling qsave_program/2 to generate a saved state with the proper options.
load.plthis file defines rules for portray/1 to modify printing rules for complex terms and customisation rules for the debugger and editing environment. It may start some of these tools.