|  A simple example showing how to make a transaction, and how to automatically log it.
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|  To make a transaction, go to the Question menu. then:
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|      *  click on
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|            in account some-name change the balance some-balance1 by some-amount to some-balance2
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|         then
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|      *  click on   some-amount
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|      *  select    Type in a value    and type in say, 100, to add to the account
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|      *  click on   Ask
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|      *  double click    Make these changes to the agent data    to confirm
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|      *  then click anywhere in the page.
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|  Note that someone logged on as 'author' could edit the log table, and so alter the audit trail.
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|  But someone logged on as 'user' can only make transactions that add correct audit trail entries to the log.
|
|  The rule to ERASE transactions is just present for demo convenience.  Normally, there would be no such rule.



the last transaction number for account some-name is some-transaction-number
after transaction that-transaction-number the account that-name had a balance some-balance1
that-transaction-number + 1 = a-transaction-number1
that-balance1 + an-amount = some-balance2
add : after transaction that-transaction-number1 the account that-name had a balance that-balance2
-----------------------------------------------------------------------------------------------------
in account that-name change the balance that-balance1 by that-amount to that-balance2


after transaction some-transaction-number the account some-name had a balance some-balance
that-transaction-number is greater than 0
del : after transaction that-transaction-number the account that-name had a balance that-balance
-------------------------------------------------------------------------------------------------------
ERASE transaction that-transaction-number showing that the account that-name had a balance that-balance


account some-name is active
max some-number : the account that-name has a transaction that-number = some-last-number
---------------------------------------------------------------------------------------
the last transaction number for account that-name is that-last-number


after transaction this-number the account this-name had a balance this-balance
-------------------------------------------------------------------------------
account that-name is active


after transaction this-number the account this-name had a balance this-balance
-------------------------------------------------------------------------------
the account that-name has a transaction that-number



after transaction this-transaction-number the account this-name had a balance this-balance 
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                0                                       Adrian Walker             0