InDesign CS4

PDF (adobe.com)

Printing

Creating PostScript and EPS files

Creating PostScript or EPS files
Choosing the right method for creating a PostScript file
About device- and driver-dependent PostScript files
Create a device-independent PostScript file
Create a device-dependent PostScript file using InDesign
Create a PostScript file using a PostScript printer driver (Windows)
Create a PostScript file using a PostScript printer driver (Mac OS)
Export pages in EPS format

community help (adobe.com)