input to a psuedoterminal

i have a psuedoterminal open in a terminal window (xfce4terminal to be exact). i want to stuff some input into it and have the shell on the slave side of the pty get it like any other typed input. everything was started under the same non-root user (there are no cross user issues). i see two possible ways, though there may be more. the 1st is that the terminal program may provide an interface to do this. the 2nd is writing directly to the master side of the psuedoterminal. i do have the tty device name from the tty command. how can i stuff type-in input into this psuedoterminal? i don't need to read the output though in the future that could be useful.