[rules-users] Does drools have any trigger?

[Lindy hagan]

I was looking at  Blaze Advisor documentation it has  “when changed”
operator that only fires when an attribute of an object changes. A business
analyst might use it to watch for any important issue, such as a thermostat
warning in a process plant or a particular stock reaching a certain price or
volume.

In similar way does Drools have this feature?

Can any one correct if I am wrong: Rules can be updated by business users
thru BRMS and Guvnor? (I did not get chance to go thru these)
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