Try investigating ODID. For example, at
http://www.gallium.com/ProductInfo/InterMAPhics/DataSheets/ODID.html
or
http://www.eurocontrol.fr/projects/dsi/te3c_uk.htm
or
http://www.comsoft.de/ka/atc/products/rdd/rdd_v0.htm
or
http://www.eurocontrol.fr/public/reports/eecreports/1995/rep292_abs.html
or
http://www.eurocontrol.fr/public/reports/eecreports/1996/rep295_abs.html
or
http://atm-seminar-97.eurocontrol.fr/graham.htm
Regards
Alex
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