The «Teacher» intended more for educational institutions, has functions for distribution and collection of files, testing students.
File distribution — opens a window for selecting and uploading files to the computers.
File collection — opens a window to select files to be collected and to begin the process of collecting.
Tests — the main window for testing.
Connections auto-list — in the list will be added all active connections, otherwise you can add contacts to the list manually by dragging them from the main window, for deleting contacts use use the menu
Check the box on those PCs in the list who will participate in the distribution/collection of files, or testing.
To authorize offline contacts use context menu.