The principle that the legislature can enact laws which bind the executive is a familiar one. The prerogative can be abrogated or abolished by legislation and the decisions of the executive made subject to administrative review.
More interesting, however, is the relationship within the federation between the legislature of one polity and the executive of another. To what extent can the laws of one polity bind the executive of another, or abrogate or abolish its prerogatives?
The High Court, over the last century, has had a very difficult time in answering these questions. Fundamental though they be to our governmental system, there has never been a clear and consistent principle established to provide ready answers to them. After the centenary of federation, one would think we would understand how the polities within that federation are intended to interact, but we do not.