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New features are constantly being added to PLT, and so it is important
track of these changes.
There are three places where changes are noted.
First, the PLT
VErsion command can be used to identify the
date of the most recent change to version of PLT linked into the program
you are using.
If certain commands do not appear to work then you should check this
Often you will find that the program has not been linked for a while
and as a result the
command that you are trying to use was added after the last link.
The second place version numbers are recorded is in the on-line
HElp VErsion command will list all recently added new
features and when they were made.
A serious attempt is made to ensure that on-line help is updated as
the software is modified.
For best results on your system,
you should also update the on-line help every time you update PLT
However, there is no requirement for these two version numbers to
Thus, when you install a new version of PLT it is not necessary to
immediately relink all software that uses it.
Finally the printed manual is updated about once a year. Therefore,
the printed manual can be slightly out of date.
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