The printer receives bytes through OUT 04h and spools them until a separate print action.
The window displays a hexadecimal dump or CP866 text. Clear removes the spool; Print sends it to the selected system printer without clearing it automatically.
The gear opens printer, paper, source, and orientation selection. Properties uses the custom or system dialog selected in Settings. The default printer and dialog mode are saved under External Devices.
The window can be detached, pinned above other windows, and attached again.