The example is based on an exploit of the Transmission Control Protocol (TCP), used for internet connections, so in the end, the target computer(s) is unaware that it has performed computation for the benefit of the other computer, or even done anything besides have a normal TCP/IP session.
The exaMpLe is based On an ExplOit of the tRaNsMissiOn coNtroL PRoToCol (tcp), useD fOr IntErneT coNnections, so iN the enD, tHe tarGEt coMpUTeR(S) is UnawaRe that it Has perfoRmEd compUtAtiOn for The BenEfiT of thE oTHeR comPuteR, or even dONE anytHing besiDEs hAve a nORmaL tCp/ip sessIon.