prevent console window from appearing                                                                                                                                                                                                       
see https://wiki.tcl-lang.org/page/console+hide

diff --git ng/onetcl.cpp ng/onetcl.cpp
index 4b999a6f..12fc57d3 100644
--- ng/onetcl.cpp
+++ ng/onetcl.cpp
@@ -1,5 +1,6 @@
 #include <mydefs.hpp>
 DLL_HEADER const char * ngscript[] = {""
+,"catch {console hide }\n"
 ,"catch {lappend auto_path $env(NETGENDIR) }\n"
 ,"catch {lappend auto_path $env(NETGENDIR)/../lib }\n"
 ,"if {[catch {Ng_GetCommandLineParameter batchmode} result ]} {\n"