As far as I understand it, there is a routine reinstatement of a large amount of business; it's not all the business, but a large amount of business is routinely reinstated. So matters that began in one session would be picked up in the next session from essentially where they were previously. That's my understanding.
I could be misinformed on that, but in effect, it's something similar to what occurs in this House of Commons, where in recent years a fair number of the matters that died on the order paper are reinstated in the next session, essentially where they were before. I think that's the case in most of the modern parliaments; there's quite a wide scale of reinstatement of business.
What is unusual in some instances is that in some parliaments, the existing parliament can state that they want these particular issues to carry over into the next session. So it would be possible, where prorogation is done on a regular basis, that prior to prorogation the House passes a motion saying that “Bills 34, 36, and 59 shall be reinstated”, and this in effect gives no option to the House or the government in the next session.
In New Zealand, they did that with their parliament. You could reinstate issues from one parliament to another, which would be curious, because then an election could occur between events, and the election could be fought on issues where the public was saying, “We reject those policies that were being proposed in the old parliament”.
That's one reason why, in 2005, New Zealand stopped the ability of a current parliament to state that matters shall be carried forward into a new parliament, because they believed that things should be left to a new parliament to decide whether they're carried forward. That's very different from a new session of the same parliament, where there's no theoretical problem of the same parliament binding itself to carry matters forward.