Coombs' test involves taking a blood sample which is checked for the presence of antibodies which may destroy red blood cells.
You can use the HP Print and Scan Doctor to test the status of the printer spooler, print queue, device manager, and device conflicts. 1  On the desktop, double-click the HP Print and Scan Doctor icon to open the tool. 2  Click Start on the Welcome screen. 3  Select your printer, and then click Next.  Click Fix Printing.
Picardjc wrote that Digital imaging monitor is a part of the HP software that communicates with your HP printer. This program enables you to read the inklevels, get an out of paper message, scan from the unit to the comuter and so on. Its not neccesary, but it will limit the printers use if you remove it..