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VB.NET / VBA Basics
VB.NET & VBA are case insensitive meaning you can write functions & variables in lower case or upper case.
This means if we create a variable 'dim i as integer' we can also refer to this variable as 'I'.
VB.NET & VBA are similar but not the same, read more about the differences here
If you want a more complex example (external libraries, viewers...), see the official documentation.