The handler list is a list of active handlers separated by commas. These values are used in the rest of the property file to configure the individual handlers. For example:

gg.handlerlist=name1, name2
gg.handler.name1.propertyA=value1
gg.handler.name1.propertyB=value2
gg.handler.name1.propertyC=value3
gg.handler.name2.propertyA=value1
gg.handler.name2.propertyB=value2
gg.handler.name2.propertyC=value3

Using the handlerlist property, you may include completely configured handlers in the property file and just disable them by removing them from the handlerlist.