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Thanks Darren, I'd just like to add that these are useful for when you are trying to design more generic functions that can do different things based on different data types, or developing code that can works on data types in ways that would otherwise have to be hard coded.

Here is a (poor) example.  Lets say I want to write a subVI that will take in a cluster, and will increment every numeric in the cluster, but leave all the other data types alone.  How would you do this?  Well with these functions you can look at the Variant input, and determine what the data types are of the things contained in the cluster, and if it is a numeric, convert it to the numeric, increment, and put it back in the cluster.  Certainly if you needed something like this you could write a static VI that works on your cluster but you'd need to create a new subVI for every cluster data type you have.

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