The guide can also be obatained by anonymous ftp from
lheaftp.gsfc.nasa.gov. Go to pub/yaqoob/docs/idl and get
ascaidl_guide.ps. The routines themselves can be obtained
from pub/yaqoob/ascaidl by typing "prompt" followed by
"mget *.pro". Good Luck.
Explicit reference to the System in any publication which makes
use of it is courteous and will be appreciated.