Input/output controls
These deal with access to files and streams.
\closein
Not yet implemented.
\closeout
Not yet implemented.
\endinput
Not yet implemented.
\immediate
\input
Not yet implemented.
\openin
Not yet implemented.
\openout
Not yet implemented.
\read
Not yet implemented.
\write
This is an expandable control.
_input
This class should not be accessed from TeX code, so it has been given a name beginning with `X_`.
That prefix is stripped when placing it in the
document's dictionary, so you will find this control
at `doc['_input'].
_output
This class should not be accessed from TeX code, so it has been given a name beginning with `X_`.
That prefix is stripped when placing it in the
document's dictionary, so you will find this control
at `doc['_output'].