This reticle is an extension of one used by Swarovski and Kahles as licensed by a fellow named TD Smith. The TDS reticle only has five range bars and no horizontal hash-marks whereas the Horus (formerly called the Sammut) has at least two configurations with 11 and 14 bars below the crosshair intersection and a varying number of index marks horizontally.
At first glance the reticle appears confusing and too busy but given a chance it will enable consistent long range hits. The computer program that you mention can be downloaded into a Palm pilot unit and will compliment the Horus or a mildot scope for field calculations. You simply fill in a basic info points into a series of screens and end up with hold-offs, leads or come-ups etc. The Palm is operated by tapping its screen on particular locations with a small stylus - this is how you input distance, wind, cartridge, scope data.
I have shot the reticle extensively on rifles ranging from .223 up to the .300 Win. in Schmidt and Bender variable scopes. The system works, the more you use it the more you can do with it once you get over the apparent complexity of the view through your scope. I recall making consistent hits on baseball sized rocks in a nasty wind one day with a .223 Rem. 40X out to 650 lasered yards.
This reticle demands that the user get involved with math and a special ranging process to really get the most from it - you could also say that about mil-dots. It is available in relatively expensive scopes and it best complimented with the computer program and a Palm pilot - more money. If you have a spotter you can quickly get rounds on target - just as long as you can remember which bar and hold-off your previous shot was fired from.
It is not for casual shooters, nor will it replace the mil-dot. It does offer a large number of constant aiming points in the field of view which can be used very accurately if you learn how.
The computer program is called TRAG 1S2 and the TRAG 1S5 for the Palm if anyone is interested. I can see a computer-whizz like Dave King enjoying this stuff a lot. I am a one-button person - on-off - but can force myself to use this techy stuff, particularly if my son is nearby to keep me from self-destruction.
For more info the contact is:
What we really need is a scope with a floating dot that sets itself after its computers have taken into account range, wind speed and direction, angles, elevation above sea level, rain, ballistics of the ammo, barrel length, time of day, rifle steadiness, barrel wear, shooter flatulence and the B&C score of the frigging buck.