Karl Fulves - The Shamrock Code & The Parallel Principle

After being in magic 72 hours, it occurs to everynovice that by employing a confederate for certaintricks, he gains an immense advantage; the method be-comes invisible.
The confederate is usually a layman friend orfellow magician. The main qualification for the jobhasn't changed in centuries; the confederate must en-joy intrigue and be content to remain on the sidelines,the unsung hero of the moment. In other words, he mustbe content to remain invisible.
If you and the confederate decide on a spoken orsilent code, whereby he will code to you, say, a cardchosen by a spectator, the classic impasse is reached;every code requires memory work, and usually a lot ofit.