The SMOOTH method is described in the report:

94-11.ps.Z      "A Class of Smoothing Functions for Nonlinear and Mixed
		Complementarity Problems"
		Chunhui Chen and O. L. Mangasarian
		Mathematical Programming Technical Report 94-11, August 1994,
		Revised October 1994 and February 1995.
		To appear in Computational Optimization and Applications

This report is available by ftp from:

ftp://ftp.cs.wisc.edu/math-prog/tech-reports/94-11.ps.Z

If you have a version of GAMS that supports use of MPSGE, MILES or
PATH, then the executable (for SUNOS) contained in this directory can
be used in conjunction with that version of GAMS without any
additional cost.

Contact ferris@cs.wisc.edu for further details.  Other platforms may
be also supported, please ask.