There is an equivalent description file for IDI stored in a binary file gns_ididevices (located in a similar way to the names files). This binary file is built from a text version of the description table by running idibuild. At present the description table only contains one entry which is the AGITYPE; this is mandatory for an IDI workstation. The text file looks something like:
WORKSTATION = /XW/
AGITYPE = 3800
WORKSTATION = /XW2/
AGITYPE = 3801
GNS [2.5exrkstation