cux - Virtual Terminal Program Robert J. Donovan ABSTRACT: Cux is a data communications program providing virtual terminal support for a PDP-11 running under RSX-11M. In use, it is functionally equivalent to Unix cu, managing an interactive conversation between two systems with possible transfer of text files and i/o redirection. Written entirely in DECUS C, cux is well documented and easily modified. In particular, the program can be conditionally compiled for tailored communication with VMS or Unix.