 The Lincoln and Cambridge people worked together closely and exchanged code on a regular basis", beginning a tradition of code sharing and mutual support that would continue for years.At around the same time, Union Carbide, another influential IBM customer, followed the same path – deciding to run CP/CMS, to send personnel to work with CSC, and to contribute to the CP/CMS development effort.CP-40, CP-67, and CMS were essentially research systems at the time, built away from IBM's mainstream product organizations, with active involvement of outside researchers.