Why use the Bitwise-Shift operator for values in a C enum definition?

Question

Apple sometimes uses the Bitwise-Shift operator in their enum definitions. For example, in the CGDirectDisplay.h file which is part of Core

Answer 1

This will allow for a variable to easily combine multiple flags:

unit32_t multFlag = kCGDisplayRemoveFlag | kCGDisplayMirrorFlag | kCGDisplaySetMainFlag'