Hi Full Decent, Eclipse 3.0 IDE with CDT 2.0 offers nearly real-time highlighting of error/warning lines in C/C++ code. CDT stands for "C/C++ Development Tools", a plug-in for the Eclipse IDE platform. Eclipse is the best IDE I've used. And usually, I eschew IDE's in favor of Vim. (Now only if the Vim editor was a free-and-well-integrated plug-in for Eclipse. But alas.) Sincerely, --Eljay