Depending on how sophisticated your Router is ;
You will need an RDR (Redirection Rule) to redirect port 443 requests to the SME box
You will also need a filter rule to let port 443 incoming
Other simpler routers, just enter details into the 'Virtual Server' section and add port 433 (https) and trhe LAN Ip of the SME
Now, at the remote site put in the Firefox address bar the WAN IP of the other site plus /server-manager
You will get asked some security and Voila - its like your where sitting right next to your SME !
Top Top Project ->>>>>>>>> SME R - O - C - K - S ! ! !