  Within the Hamiltonian formulation of Lattice gauge theories, prepotentials,
belonging to the fundamental representation of the gauge group and defined
locally at each site of the lattice, enables us to construct local loop
operators and loop states. We propose a set of diagrammatic rules for the
action of local gauge invariant operators on arbitrary loop states. Moreover We
propose a new set of fusion variables within the prepotential aproach suitable
for approaching the weak coupling limit.
