Mask Flags


Mask Flags are used to mask or screen out things of an unwanted type. They are used by symbols that send messages and by some verbs.

Some of the thing types listed in the mask flags chart, such as free and camera, aren't known to exist. However, there is a list in the exe of thing types which includes these types. And this exe list matches the mask flags list. So whether they exist or not, the information is correct.