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Message: [QUOTE="Walter Roberson, post: 2835563"] Yes, it is a cast of the address to become a pointer to a function returning void. The casting of a integral value into a pointer to an object type is implementation defined. The casting of a numeric value into a pointer to a function type is undefined in the C89 standard, but it is not a constraint violation so particular implementations can do whatever they want with it (possibly even something useful.) The code you have found uses non-standard extensions and is decidedly not portable. [/QUOTE]