Tektronix 4041 GPIB controller

There were a number of posts on this list over the last year on the topic of the Tek 4041 GPIB controller. Ive got one of these suckers now, plus a number of Tek plugins with GPIB interfaces, and Im interested in making them all play together. I havent got a keyboard, and I recall some posts from Joe Rigdon? saying keyboards are very hard to find. In the meantime, Ive figured out the keyboard electrical interface characteristics and made a rs232-keyboard converter. So I can talk to it now, and give it little BASIC commands, and see the results on the LED display Ive figured out much of the BASIC dialect it speaks, but I cant yet figure out how to open the printer, serial port or tape for IO, nor have I got the docs yet. Can anyone shed some light on the exact syntax for the BASIC open call used by the 4041 and the get() function for reading GPIB devices? Cheers.