USE flags doubts (again).

If I run this command:

emerge -pv hplip

the output is:
[ebuild   R   ] net-print/hplip-0.9.7-r3  +X +cups +foomaticdb -ppds +qt 
+scanner* -snmp +usb 0 kB

There are 5 flags prefixed by a plus and red coloured (+X, +cups, +foomaticdb, 
+qt and +usb). These flags are already set. Right?

There are 2 flags prefixed by a menus and blue coloured (-ppds and -snmp). 
These flags are not set. But, should I set them?

Finally there is anoter flag prefixed by a plus and green coloured 
(+scanner*). What does the trailing * mean? What does the green colour mean?

Thank you a lot in advance.

emilio

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