Presuming you mean "X11" when you ask about *NIX, the answer is probably "yes but not as simply". See man xterm for information on the -S option which allows you to open a pty and have xterm grab the other end. Any output you write to the pty will be displayed in the xterm (and theoretically one could also read input from it).

Update: Oh yeah: IO::Pty may be of assistance getting a pty for this.

Update: And while not exact code, see opening and writing to another xterm for the steps to take.