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# Lua Interface
After startup, Textadept relinquishes control to Lua. At this point, having a
Manual is pointless since all of Textadept's functionality is dynamic from here
on out. This is where the most important resource for help comes in: the
[LuaDoc][LuaDoc]. It contains not only documentation for Textadept's Lua API,
but documentation for all of its modules and features as well. It is more up to
date than a manual like this could ever be.
[LuaDoc]: ../index.html
## Global Variables
The following global variables not mentioned in the LuaDoc are available in
Textadept's Lua state:
* `arg`: Table containing the command line arguments passed to Textadept.
* `_HOME`: Path to the directory containing Textadept.
* `WIN32`: If Textadept is running on Windows, this flag is `true`.
* `MAC`: If Textadept is running on Mac OSX, this flag is `true`.
* `_CHARSET`: The character set encoding of the filesystem. This is used in
[File I/O][file_io].
* `RESETTING`: If [`textadept.reset()`][textadept_reset] has been called, this
flag is `true` while the Lua state is being re-initialized.
[file_io]: ../modules/textadept.io.html
[textadept_reset]: ../modules/textadept.html#reset
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