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NULL_KEY is a constant indicating an empty (null) key: "00000000-0000-0000-0000-000000000000".

NULL_KEY should always be used instead of an empty string. Even though the latter works for most LSL functions, it is bad style and can cause hard-to-track-down bugs in your script:

key foo;

foo = "";
if (foo == NULL_KEY) llSay(0, "This is never true");

This is because the empty string "" in a key is a different value from NULL_KEY.

Constant | Hacks
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