[GRASSLIST:7469] DEM import

[s99171059 at tuks.co.za]

Hi there 

I am trying to import a DEM (digital elevation model).  The files I want to 
import are 
.hed and *.dat  files.

I tried to use s.in.* modules, but for some or other reason, my Grass 6 
doesn't have these features. Install the s.* modules?

Is there some specific feature for DEM import?  If so, which type of files is 
recognised by it?

Thanks
Kobus