Hi Monty, That's kind of a big question.
I'm assuming that you have the zen cart mod downloaded from the zencart site.
First, download both the zen mod and HCL and unzip them on your local computer.
Then, you need to set up another directory under your main domain. E. G. "hxxp: www. yourdomain. com/zenstore/" and "hxxp: www. yourdomain. com/hcl/". And upload HCL to your HCL directory.
Depending on how you want to do your mysql database, you can either combine your HCL database with the zencart database or create a new one. I lean towards creating a new one just to avoid conflicts. Install the database using the instructions provided with hcl.
After you've uploaded and installed HCL, use the code generator to generate the code and insert it in the zen-cart file per the zen mod instrucitons. Sorry I'm not more specific, I'm on the road right now and don't have the particulars right now.
Upload the zen mod files per the zen mod instructions. Configure in your boxes section. It should work.
A few notes:
For your domain in the HCL config file, use your secure server i. e. , "https" otherwise you'll show something like "this page displays secure and non-secure items when you're in checkout.
Check the timers in the config files. Some people seem to have trouble with that although I hadn't.
When you assign operators, be sure they're checked in the assignments otherwise it will always show off line.
Good luck, again sorry if i was vague but the detailed instructions are provided with each of the downloads. If you follow the instrucitons that comes with HCL and the Zen mod you shouldn't have any problems. If you do have specific issues, check back.
Finally, it does work. You can see it in action at clearlyoptics. com.