question about remote access

I'm interested in the AS-602T or 604T. I logged into the live demo and really like the interface. I was reading the user manual about remote access and have a few questions. The questions are focused around remote access for family members to view pictures and videos with occasional music streaming.
The manual mentions being able to connect directly with the NAS:
"b. Connecting directly
Enter http://Your Cloud ID.myasustor.com:8000/ to connect to your NAS. For example, if your
Cloud ID is “johnny” then you would enter http://johnny.myasustor.com:8000/.
Question #1 Does this mean it is really direct, like VPN? ( I'm new to this but read that VPN is a direct connection and secure)
Remotely connecting through the Asustor website: ("a. Connecting through the myasustor website
Enter http://www.myasustor.com/ into your Web browser. Enter your Cloud ID into the
required field and then click on [ping]. Once the [Go] button appears, click on it to connect to
your NAS.")
Question #2 Does the Asustor site act a middleman for all traffic, or is is more like a ip-pointing service?
Question #3 When remotely accessing the unit, what does the opening screen look like? Is it like logging into the live demo?
Question #4 I haven't gotten far enough in the manual, but is there mac address or ip address-level access restrictions for remote users?
Thank you for any help you can provide.
The manual mentions being able to connect directly with the NAS:
"b. Connecting directly
Enter http://Your Cloud ID.myasustor.com:8000/ to connect to your NAS. For example, if your
Cloud ID is “johnny” then you would enter http://johnny.myasustor.com:8000/.
Question #1 Does this mean it is really direct, like VPN? ( I'm new to this but read that VPN is a direct connection and secure)
Remotely connecting through the Asustor website: ("a. Connecting through the myasustor website
Enter http://www.myasustor.com/ into your Web browser. Enter your Cloud ID into the
required field and then click on [ping]. Once the [Go] button appears, click on it to connect to
your NAS.")
Question #2 Does the Asustor site act a middleman for all traffic, or is is more like a ip-pointing service?
Question #3 When remotely accessing the unit, what does the opening screen look like? Is it like logging into the live demo?
Question #4 I haven't gotten far enough in the manual, but is there mac address or ip address-level access restrictions for remote users?
Thank you for any help you can provide.