AX Retail(POS) logical topology

Hi, Retail module of AX 2012 comes up with a lot of details. I'm showing below its logical topology. Without diagram connection, service accounts and etc. make me very headache. :-)

Basically, there are 2 type of connection from/to AX and retail components. Async is for batch transfer, day end transactions, etc. Real-time, as its name, it's for the connection need to do immediately.

The component naming vary to the app version. I'm writing this on AX 2012 R3.

Single store

Multi store