The Acumen IT Support blog provides you with helpful articles about Microsoft RemoteApp.

Microsoft RemoteApp makes it easy for you to access remote programs as if they are running on the end user’s local computer. RemoteApp can reduce complexity and reduce administrative roles in many situations, such as branch offices where IT support may be limited, situational remote access, deployment of LOB programs and environments where users do not have assigned computers.

This web site provides a good overview.

Official Microsoft RemoteApp Overview