Open Terminal. In Terminal, cd to /Users/Shared/America Online/Data and then hit Tab before you hit Return -- this will fill in the rest of the directory name. Once there, you want to type in vi Main Database. Once the database is loaded type in /Guest; this will search the database for the word Guest. Once it finds it, type in the following: r [space bar]. You will see the letter (should be the letter G) that is highlighted be replaced by a space. Move over to the next letter (you can use the arrow keys for this) and repeat the step. Once you have done this to all five letters, type :wq; this will save the file and quit vi.
Now download the following application: FileType. Then launch FileType, click on Add File and select the Main Database (should have the Unix Executable icon on it). In the right-hand Creator box, type in AOp3 and in the adjacent Type enter AODB. Make sure both change check boxes are selected, then click Change.
You can now launch AOL and notice that Guest is not present.

