[mkgmap-dev] What does --transparent do?

Hi! I am trying to figure out what the --transparent parameter does exactly. I am aware that it suppresses the creation of the backround rectangle with id 0x4B. But it also seems to influence an element of a file header in TREHeader.config(), setting poiDisplayFlags |= POI_FLAG_TRANSPARENT; I could not figure out what this part means. What does this code do? When is it called? Does it influence the handling of the map on the device? bye Nop