  Given a finitely presented monoid and a homotopy base for the monoid, and
given an arbitrary Schutzenberger group of the monoid, the main result of this
paper gives a homotopy base, and presentation, for the Schutzenberger group. In
the case that the R-class R' of the Schutzenberger group G(H) has only finitely
many H-classes, and there is an element s of the multiplicative right pointwise
stabilizer of H, such that under the left action of the monoid on its R-classes
the intersection of the orbit of the R-class of s with the inverse orbit of R'
is finite, then finiteness of the presentation and of the homotopy base is
preserved.
