1 03/31/83  unique
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 3 Syntax:  unique {arg}
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 6 Syntax as active function:  [unique {arg}]
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 8 
 9 Function:  returns a unique character string as generated by the
10 unique_chars_ subroutine (described in the Subroutines manual).  Unique
11 character strings are 15 characters long and begin with an exclamation
12 mark (!).
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14 
15 Arguments:
16 arg
17    is an octal number from which the unique character string is to be
18    generated.  If arg is omitted, the current clock value is assumed.