File deletion system in a file unit

Claim 1

A data processing system comprising a file deletion system for deleting a particular message stored in a file unit comprising; a keyboard having at least a deletion key (7), a deletion set/reset key (7a), an execution key (11), cursor shift keys (13), and some alphanumerical keys, file generator means for generating a file directory, wherein said file directory comprises a list of files containing at least said particular message, a display means for indicating said list of said file directory containing said particular message, a file directory control means for indicating said list of said file directory of messages on said display means upon depression of said deletion key (7), said file directory includes at least a deletion set/reset code and an initial group of characters of each message reflecting the content of said message, a cursor control means for shifting a cursor up and down on said display means upon depression of said cursor shift keys (13), and initiating a cursor location on said deletion set/reset code of a first message upon depression of said deletion key (7), a deletion set/reset control means for changing said set/reset code under the cursor upon depression of said deletion set/reset key (7a) between set code and reset code, a deletion execution means for deleting a message in said file unit designated by the file directory with deletion set code upon depression of said execution key (11).