"work on data" is the definition of "app". Unless you're willing to go through your hard drive platters yourself with a magnetized needle ? (or whatever the eq

"work on data" is the definition of "app". Unless you're willing to go through your hard drive platters yourself with a magnetized needle ? (or whatever the equivalent is for SSDs) EDIT : Though even in that hypothetical case, you would need to follow an "app" (more commonly known under the term "algorithm") to be able to make sense of the magnetic domains that you're detecting !