|Exact match = SEARCH LOOKUP ( Lookup id, Key$ )|
|This function searches for the specified key within the lookup table. If an exact match is found, this function will return a value of 1. Otherwise it will return a value of 0.
The 'current' pointer is advanced to the key if an exact match is found, or to the next key otherwise. Note that this can mean that the 'current' pointer does not point to a key/value (you can check with the LOOKUP IS VALID() function).
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