Add external file to project...
This will open the already explained open dialog. You can select a file and when it's selected, CA3 will add the file to the current project. If there's no project available, a new project will be created.
Add active window to project
This will add the active edit child to the current project. If there's no project available, a new project will be created. If the active child is not an edit child then this option will not be enabled.
Remove active window from project
This removes the active edit child from the project. If the window is not part of the project, nothing happens, if the window is the last file in the project, the project will be closed (no project will be available anymore).
Add all windows to project
This option is the same as the Add active window to project, the difference is that this option adds all open edit childs to the project.
Compile 'Filename'...
This option compiles the active edit child. It will open the compile window and execute TASM to compile the file. More about compiling files later on in this help file.
Compile 'Project Filename'...
This option will build the project if a project is available. It will open the compile window and compile all files in the project that need to be compiled. More about building projects later on in this help file (in the chapter where I will discuss projects).