Simultaneity/versatility of movement

Trying to come up to speed here. Since subing to this list, I've seen a few
posts that seem to skirt this issue, and may indeed have covered it, but I may
have missed the point.

My question has to do with complex simultaneous movements, and I'll posit a
hypothetical part to illustrate. The old 4 sided ziggurat type pyramids had a
ramp that started at the base, and wound around and around up the sides till it
reached the peak. For the part, lets say that we want to do a round conical
version with a ramp that spirals around until it reaches the top. To keep it
simple, lets do the sides as a vertical wall rather than angled to a cone angle.
Lets start with a part that has allready been roughed out so that what we're
dealling with is a finish, or close to finish cut, and the ramp is a simple four
corner spiral up to the peak.

For those not familier with the term, "four corner spiral", you start with a
square, and put the point of a compass on one corner, and the pen on an adjacent
corner, drawing an arc outwards until you come to a point where it would cross
an imaginary line drawn from the opposite adjacent corner through the point
corner. You then put the point on that opposiite corner, and placing the pen on
the end of the first arc, continue around and around, drawing a spiral.

Now for the questions. :-)

can the xyz movements be programmed simultaneously; I.e., xyz starting
position, downward angle, arc point/ends, and arc direction all at once, for
each corner/arc, or would each move have to be individually programmed, one
teensy movement at a time?

Is this controller/software dependent? If some but not all moves can be done
with a single controller, can multiple controllers be used with some degree of
simultaneity and accuracy, either through the software or with hardware signals?
In other words, is there some sort of, "accept the command but wait for the
hardware/software trigger signal", type function?

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