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the symbol table is a hierarchical 
directory of E-Mail addresses frequently used.  There are three types 
of symbol table entries:

Person: Information to an
individual recipient.  Apart from the mandatory instructions (E-Mail 
address, name) the symbol table administers also the postal address, 
telephone, birth date as well as a picture of the person.

Mailing list: An enumerating of non-standard recipients, 
which can be addressed with only one alias.  Mailing lists are used 
for circulars and indicated in the symbol table by a list symbol 
(three small headings).

Group: A sublist within 
the symbol table, which contains further entries (persons, mailing 
lists and/or groups).  Groups serve to keep the overview of the symbol
table and in fat writing are represented.  ' alias ' is the unique 
identifier of a symbol table entry.  Such a contraction may not occur 
twice, otherwise YAM cannot determine the appropriate E-Mail address 
unique.
 Examples: AnnaM, Fox (persons);  Beta 
tester (mailing list);  Business, private (groups) new entries always 
appear in the highest hierarchy of the symbol table.  Use Drag&Drop, 
in order to shift an entry into another group.  A group knows through 
clicks on [ the +]-symbol to be opened or with [ - ]-symbol be closed.