. . "For the company, see PV Crystalox SolarPVCS Version Manager (originally named Polytron Version Control System) is a software package by Serena Software Inc. for revision control of files, in particular source code files.PVCS follows the \"locking\" approach to concurrency control; it has no merge operator built-in (but does, nonetheless, have a separate merge command)."@en . . . "8.4.6" . . "PVCS Version Manager"@en . . . . . .