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Although scripts can run in the background and output text to the Console often a graphical user interface is required. This way the logic of a script can be changed based on options set by the user. There are two options. For more complex user interfaces, Lua ships with the iup GUI library. Please refer to the documentation of the library, as its usage is beyond the scope of this document:
http://webserver2.tecgraf.puc-rio.br/iup/
The other option is a build-in dialog called AskUser.