HP 48GX Hidden Directory

[Han]

You could create all your programs and store them in port memory. I would make two directories: one containing the actual programs, and a second that contains "wrapper" programs that basically call the routines from the first directory AS STORED IN PORT MEMORY. Then keep both directories in port memory. Use the second directory and copy it into main memory. If your friend accidentally deletes this, then you can just copy the second directory back from port memory into main memory. The main programs, however, will always stay in the first directory and never be visible to anyone except the "wrapper" programs since it is generally harder to access port memory.