[texhax] Defining a new font in Plain Tex

[Firestone, Elaine R. (GSFC-279.0)[SCIENCE SYSTEMS AND APPLICATIONS INC]]

Here's a new problem for me. I want to use a font that isn't computer modern or related to TeX in any way. (It's "Bank Gothic" if anyone's interested, and yes, it's one my computer... a Mac running Snow Leopard.) Can anyone tell me what code to use to allow me to use this? Knuth and Bechtolshein only mention "other fonts" and "third party fonts can be used" and mention "metafonts," etc., but don't give the actual coding for it. I'm not a TeX expert per se, just someone who has to use it because I'm told to, so I'm a little lost.

Can anyone help?

Thanks.

Elaine