After the logfile is opened, the data can be written to the
logfile with the WRITELOG intrinsic. Data will be
passed in the WRITELOG intrinsic call and User Logging
will add 9 words of information to the beginning of each record.
The 9 words of information describe which process recorded the
data, when it was recorded, which User Logging intrinsic was used
to record it, and a checksum for validity checking. The data
supplied by the user should include information about the
action being recorded, such as:
What was the purpose of the transaction
Which record in the file was modified
What did the data in the record look like after the action
Enough information must be included to allow the user to recreate the
action from the log record if recovery is necessary.
