Also see sk107536 - Check Point Capsule VPN available for Windows 10
Check Point Mobile VPN plugin uses SSL. It is now part of Windows 8.1 (including Windows RT 8.1).
Mobile VPN in Windows 8.1 is called "Check Point VPN Plugin" and it is pre-installed in the Operating system. No installation is necessary.
This is also the only client that is available in Windows RT (Surface RT for example).
To learn how to configure the VPN Plugin, refer to Capsule Connect and Capsule VPN Clients Administration Guide - "Windows 8.1 VPN Plugin for PC" section.
No. VPN plug-in is not running if you do not have a VPN Site configured (and connected).
There is no integration between the two. If the user wishes to use Endpoint Security Client, there is no need to use the VPN plugin (no need to configure a VPN Site for the VPN plugin).
VPN plug will be upgraded via Microsoft updates mechanism. It cannot be upgraded in another way.
VPN plugin uses the default realm. For additional information about realms, refer to sk86240 (Multiple Authentication Schemes for Mobile Access/Remote Access).