Explanation
Captive Portal is one of the authentication methods used for Identity Awareness, which is a feature of Check Point that enables you to identify users and apply security policy rules based on their identity. Captive Portal redirects users to a web page where they can enter their credentials and be authenticated by an external server, such as LDAP or RADIUS. After authentication, users can access the Internet and corporate resources according to the security policy rules that apply to their identity.
The references are:
Machine Authentication & Identity Awareness - Check Point CheckMates
Check Point Certified Security Expert R81.20, slide 13
Check Point R81 Identity Awareness Administration Guide, page 9

Explanation
AppWiki is the Check Point feature that enables application scanning and the detection. AppWiki is an easy to use tool that lets you search and filter Check Point's Web 2.0 Applications Database to find out information about internet applications, including social network widgets; filter by a category, tag, or risk level; and search for a keyword or application1. AppWiki helps you to identify and control the applications on your network, and to apply granular policies based on the application type, risk, and characteristics1. AppWiki is integrated with the Check Point Application Control Software Blade, which provides the industry's strongest application security and identity control to organizations of all sizes1.
References: 1: AppWiki | Check Point Software