[texhax] How do you make * macros?

Michael Barr barr at math.mcgill.ca
Fri Oct 22 15:37:24 CEST 2010

Assuming I have a macro \xxx that does something, how do I make \xxx* that 
does something slightly different?  If think I make something using 
\@ifnextchar, but there is probably an "official" way of doing it that I 
don't see in the Companion (1994 edition).


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