The LOGIC keyword represents the .Net Boolean type. This type can have either of two values: true, or false.
If you have members of type LOGIC in VOSTRUCT or UNION types then these will not be represented with .Net Boolean types because the size of these Boolean is 1 byte but in the Windows API LOGIC values are represented with 4 bytes. Therefore the compiler will replace these with a special type __WinBool which has 4 bytes and has implicit converters between Logic and __WinBool.
