Hana Cloud Integration with Y Commerse Y Marketting and C4C

Hi Experts ,

I believe HCI is good when it comes to integrate Hybris Commerce, Hybris Marketting and C4C. But I also think , inorder to connec "internally" within these hybris products , at times we :

1. Need to follow some standard out of the box deployments in HCI.

2. At times there is NO NEED of HCI to connect these servers- the can internally connect - have independent interfacing capability.

3. There can be cases where we might need heavy customization ( may come as a customer requirement) and need to do it .

I was wondering if the experts can provide me some link to HCI integration capabilities and limitations to integrate Hybris Commerce, Hybris Marketting and C4C