1 02/11/85  decode_access_class, dac
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 3 Syntax as a command:  dac STR
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 6 Syntax as an active function:  [dac STR]
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 9 Function: decodes a character string produced by the
10 encode_access_class command or the convert_access_class_$encode
11 subroutine to return the authorization or access class.
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14 Arguments:
15 STR
16    is the encoded access class string to be decoded.  The null string
17    is converted to the string "system_low."