Ola, I am running Fedora 15 64-bit. uname -a ... 2.6.40-4.fc15.x86_64 #1 SMP Fri Jul 29 18:46:53 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux When I run idlhelp, it brings up my default browser with a page that has frames on it but no text. The frames look similar to another user who is using Mac OS X. Here is my !version from IDL. IDL> help, !version ** Structure !VERSION, 8 tags, length=104, data length=100: ARCH STRING 'x86_64' OS STRING 'linux' OS_FAMILY STRING 'unix' OS_NAME STRING 'linux' RELEASE STRING '8.0.1' BUILD_DATE STRING 'Oct 7 2010' MEMORY_BITS INT 64 FILE_OFFSET_BITS INT 64 I use a work around by pointing my browser to the /usr/local/itt/idl80/idl80/help/online_help/IDL/content/Reference Material directory, but this requires some fore knowledge. It works, but isn't ideal. I have IDL_DIR pointing to /usr/local/itt/idl80/idl80/bin Thanks for your help, Dave