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[Acronym from the scene in the film version of 'The Wizard of Oz' in which true nature of the wizard is first discovered:

"Pay no attention to the man behind the curtain."]

1. A stage of development of a process or function that, owing to incomplete implementation or to the complexity of the system, requires human interaction to simulate or replace some or all of the actions, inputs, or outputs of the process or function.

2. Of or pertaining to a process or function whose apparent operations are wholly or partially falsified.

3. Requiring prestidigitization.

The ultimate pnambic product was "Dan Bricklin's Demo", a program which supported flashy user-interface design prototyping. There is a related maxim among hackers:

"Any sufficiently advanced technology is indistinguishable from a rigged demo."

See magic, sense 1, for illumination of this point.