Station-IC and Agent-IC - What is the difference?

What is the functional difference between Agent-IC and Station-IC?

Agent-IC runs on iOS and Android mobile devices.
Station-IC runs on Windows and MacOS computers.

Agent-IC is optimized for mobile operation.
Station-IC is optimized for multitasking desktops with a scalable user interface and an always-on-top Compact mode that the end-user can assign Favorite keys to.

Station-IC - Normal Mode

Normal mode - Different Widths

Compact Mode – Loaded with user’s Favorite keys