|Is valid = IS VALID INI KEY ( Key )|
|This function can be used to verify that the specified key is safely usable when written to an Ini file. It will return 1 if it is, or 0 otherwise.
Note that whether or not the key is valid, the key can still be used within a lookup table and the SAVE LOOKUP TO INI will attempt to use it, but it is unlikely that the value will be loaded correctly at a later date.
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