groff: Register Index

 
 Appendix E Register Index
 *************************
 
 The macro package or program a specific register belongs to is appended
 in brackets.
 
    A register name 'x' consisting of exactly one character can be
 accessed as '\nx'.  A register name 'xx' consisting of exactly two
 characters can be accessed as '\n(xx'.  Register names 'xxx' of any
 length can be accessed as '\n[xxx]'.
 
 [index]

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