🚀 go-pugleaf

In June 1989 issue of IEEE's Spectrum magazine, there is an article on
"Virtually a virus, but for a good cause" :

  Computer Viruses -- and other programs that disrupt networks or other-
wise play havoc with computer systems -- have been in the limelight
lately.  Now an over-the-counter program advertises a utility that lets
it clone itself from one microcomputer to another over a cable.
  The facility is not a virus, but it behaves like one -- except that
the target must agree to be "invaded." Nor is it a simple COPY command,
since it copies files from the domain of one independent system into
that of another.
  The program is LapLink III, a file-transfer utility from Traveling
Software, Inc., Bothell, Wash.  To transfer files from a PC with LapLink
intstalled to a second machine without it, users enter a one-line
command, and the program will send a copy of itself across the wire.
  However, Traveling Software has built in a safeguard: the program
installs itself only if the user types the MS-DOS MODE command to alert
the second PC's operating system that a file is to be received.  By
requiring that the receiving machine be notified of the transfer,
LapLinks' designers have reduced the chance of malice.
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