NSIS: What is a registry?

Question

What is a registry in NSIS? How do you write to and read from a registry?

Answer 1

You mean the Windows Registry, which you are able to modify with NSIS?

In this case, this article may help you to clarify something: What is the Windows Registry?

After that, you are able to understand and use the NSIS-Commands

WriteRegStr
ReadRegStr

A detailed example can be found here: ReadRegStr and here: WriteRegStr

Answer 2

It's the Windows registry. An example on reading and writing it from NSIS is the first result here