  It has recently been determined that, within the framework of the Exact
Renormalisation Group, continuum computations can be performed to any loop
order in SU(N) Yang-Mills theory without fixing the gauge or specifying the
details of the regularisation scheme. In this paper, we summarise and refine
the powerful diagrammatic techniques which facilitate this procedure and
illustrate their application in the context of a calculation of the two-loop
beta function.
