Gentlemen: I am using Microsoft Windows 95 and Visual C++ 6.0 I already have builded GA245.lib and runned randtest, ex1, ex2 and tspdemo, but, Linking gademo gives me this error message: "GA245.lib (GABin2DecGenome.obj) unresolved extend symbol _errno". ¿Any idea? Thanks Daniel E. RODRIGUEZ tss at ieee.org <tss at ieee.org>