Andative and Venitive

1)
What do "Andative" and "Venitive" _mean_, exactly?
Do different authors mean different things by these words?
Or do they mean different things in different contexts?

2)
What features, in various natlangs, and ObConLang in various conlangs,
would you describe as "andative" and "venitive"? and what do you think
various well-known authors would describe as "andative" and "venitive" in
your, or someone else's, conlang(s)?

3)
In some languages the words for "go" and "come" are different depending on
whether or not the point of departure and/or the destination is the home of
the agent; and it may be sensitive to whether the embarkation point or
destination was the home before the movement, or will be the home after the
movement.
In some languages the words differ depending on whether the movement brings
the agent closer to the speaker or hearer or further away.  In some
languages this is sensitive to whether it is the current position of the
speaker or addressee that is relevant, or rather, the position the speaker
or addressee had or will have at the time of the action.

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They're kicking us out, so no more.  Hope this was understandable.

eldin