According to the Hermetic maxim "As above, so below", meaning events in the stars or heavens are mirrored on Earth, it is necessary to look at an astral chart for the event. Crowley states in his 'The General Principles of Astrology'(2002)

"The astrologer claims to be a creative artist as much as the poet, painter or musician, and he will never attain to real greatness in his profession if he allows himself to be bound down too tightly by tradition, or even by the calculation of his own experience.

We are all human, but we are only worthy of the name of human insofar as we are divine. Inspiration, and nothing else, distinguishes humanity from the beasts that perish."(p.48)

I have found that evil Occult murderers have often made their actions obvious in astral charts. I simply take a look and attempt to discern a pattern to interpret. It is often blatantly obvious.

For example, here's the astral chart of the alleged airline hit on 911. The symbolism is quite obviously the eye in the triangle.  http://xs220.xs.to/xs220/07415/WTC1hit.gif
 http://xs330.xs.to/xs330/08354/eye472.jpg

As a further example, here's an astral chart of the death of Jean Charles de Menezes.
 http://xs216.xs.to/xs216/07241/death2.gif

It is the 'Goat of Mendes'
 http://xs130.xs.to/xs130/08354/goatstar582.jpg

...

Gematria

In my researches I have approached gematria as a covert form of communication or steganography. Bill Heidrick's site  http://www.billheidrick.com/works/heidrick.htm is a good source on gematria and provides the Gematria reference http://www.billheidrick.com/works/hgemat.htm. Primes are very important. Follow the numbers. Final letters are important (remember that Hebrew is written right to left) and may correspond to tarot symbolism.

What to decipher using Agrippa's code and the reference?

Who, Where, When, What and Why?

Who? Names of people, people's parents. Also (although not gematria - look at the meaning and origin of names and parents' names. Names of detainees, - those who control orders are applied to, etc.

Where? Location 911: World Trade Center, New York, Statue of 'Liberty', Shanksville, Somerset County

I'll give you just one example since you should do it for yourselves. 'World Trade Center' translates to 'the Garden of Eden'.

When? Dates and times. Times are likely to relate to the astral chart i.e. timed to reflect what is happening in the stars.

Dates: date e.g. 911, 77, 311. The number of days into the year and the number of days remaining in the year are important. These are readily available by searching wikipedia with the date e.g. 11 September for 911. Remember to consider whether it's a leap year. 11 September has 111 days left to the end of the year.

Dates often commemorate a previous event e.g. 11 September commemorates the "Beheading of John the Baptist (or The Forerunner) in the Eastern Orthodox tradition (Julian Calendar)." wikipedia, 22 July - the murder of Jean Charles de Menezes - commemorates Mary Magdalene wikipedia and 7 July (London explosions) commemorates 'Saba Saba Day' (apply gematria) wikipedia.

Differences between dates, especially patterns of 911 days or 9 months and 11 days. There are 912 days between 911 and 311 Madrid bombings.