What are the differences between gridMathematica Local and gridMathematica Server?
gridMathematica Local is always attached to an existing single-machine Mathematica license and can be run only on that machine by the user of that license. gridMathematica Server kernels can be run on any available hardware, accessed from any Mathematica license on the network, and be divided among any number of users up to the maximum number of kernels available.