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Terminal Input/Output
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	\typein: Read text from the terminal. 
	\typeout: Write text to the terminal. 

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	\typein ::typein::
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\typein[cmd]{msg} 
Prints msg on the terminal and causes LaTeX to stop and wait 
for you to type a line of input, ending with return. If the 
cmd argument is missing, the typed input is processed as if 
it had been included in the input file in place of the 
\typein command. If the cmd argument is present, it must be 
a command name. This command name is then defined or redefined 
to be the typed input. 
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	\typeout ::typeout::
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\typeout{msg} 
Prints msg on the terminal and in the log file. Commands in 
msg that are defined with \newcommand or \renewcommand are 
replaced by their definitions before being printed. 

LaTeX's usual rules for treating multiple spaces as a single 
space and ignoring spaces after a command name apply to msg. 
A \space command in msg causes a single space to be printed. 
A ^^J in msg prints a newline.