Source Code Directory
When you create an ABF application, you specify the directory to hold the source code for frames, 4GL and host language procedures, and reports. ABF never deletes or purges files from this directory.
VMS: Vision purges obsolete versions of the generated 4GL code from the source code directory.
If you do not specify a source code directory, the default is the directory from which you started ABF. You can change the source code directory on the Application Defaults window; however, if you do this, you also must copy any source code files to the new source code directory.