To clarify: Do they need to buy and License copies of Filemaker to do this (5 simul connections)
or can they like normal filemaker use just the runtime solutions i supply them with.
Run time solutions are limited to be stand alone systems. They can neither serve as clients nor as hosts of a shared database solution.
They'll need those 5 licenses.
You might recall that FileMaker Inc. is in business to make a profit and allowing developers to set up hosted databases using runtime clients could significantly affect their bottom line.