This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)
Mathematica Session History
The history of an interactive Mathematica computation is both maintained in a fully editable Mathematica notebook, and is stored symbolically in a sequence of In and Out objects that can immediately be used in other Mathematica commands.
Out (%, %%, %n, ...) — output expressions
In unevaluated input expressions
InString original input strings
MessageList messages produced while generating each output
Ctrl+L copy down an input line (InsertInput from Above)
Ctrl+Shift+L copy down an output line (InsertOutput from Above)
InputForm show output, graphics, etc. in input form
$Line resettable current line number
$HistoryLength number of previous outputs to keep
$OutputSizeLimit maximum size of output to give explicitly
CellNotebook History summarize the editing history of a notebook
Saving Session History Information
Save save definitions for symbols, functions or contexts
Put, PutAppend save Mathematica expressions
File Save