Avision AVA3 400 - Manual (Page 29)

Scanner Operation
4-2
3. The Mac Plug-in user interface will pop up on the screen.
4. Place the document upside down on the document glass
with the text facing away from you.
5. Click the Preview or Scan button to preview or scan your
document or image.
Figure 4-1 Mac Plug-in user interface
*TWAIN: Stands for Technology Without An Interesting Name, an
industry-standard protocol which exchanges information between
the application and image acquisition device such as scanners.