This is the software publisher's description.

CrossLoop is a free secure screen sharing utility designed for people of all technical skill levels. CrossLoop extends the boundaries of VNC’s traditional screen sharing by enabling non-technical users to get connected from anywhere on the Internet in seconds without changing any firewall or router settings. It only takes a few minutes to setup and no signup is required.

Security is built into all aspects of CrossLoop. Session data is encrypted at the end-points before being sent using a 128-bit encryption algorithm using a randomly generated 12-digit access code. Explicit permission is required before any screen images are sent to a remote computer. CrossLoop is a secure tool to remotely assist any PC or Mac on the planet.

CrossLoop's underlying technology was created to simplify the process of securely working with others located in different physical locations across diverse network environments. CrossLoop enables you to see the screen and control the mouse and keyboard on a remote computer using VNC. It is as if you are working side by side at the same PC or Mac. CrossLoop is a powerful productivity tool that enables you to quickly collaborate in with anyone in the world.

CrossLoop is powered by the proprietary CrossLoop VIP Tunnel, a secure peer-to-peer data transmission system. CrossLoop encrypts all files and messages exchanged on our network to ensure user privacy. Only you and your invited friends or family can view or share control of your computer. A CrossLoop session can only begin on your computer by explicitly inviting them to begin a session. All data sent over the CrossLoop network is encrypted at the endpoints using a 128-bit Blowfish encryption.

This is the brand new Mac version of CrossLoop that enables you to connect to a remote PC (or Mac), then share and control the desktop. So you could control a remote PC from your desktop Mac.