HP 39g Master Manual page 23

The PLOT view is used to display the function as a
graph...
The key gives access to a number of other
useful tools allowing further analysis of the function.
Although these views are superficially different in other aplets, the basic idea
is usually similar.
Having said that aplets are best thought of as "working environments", it is
equally true that aplets are essentially programs, with the standard ones
simply being built into the calculator. This is a programmable calculator,
having its own programming language and able to perform quite
sophisticated tasks.
Unless you particularly want to learn about the programming language, there
is no reason why you should worry about it. The standard aplets will cover all
of your normal requirements in mathematics.
However one of the great strengths of the hp 39g+ is its ability to "download"
additional aplets from other calculators, from a PC or Mac and from the
Internet. See page 200.
A cable and software were provided with your hp 39g+ which you can use to
connect your PC or Mac to your calculator and then download aplets from the
computer to the calculator or to save your work to the computer. If you have
an hp 38g, hp 39g or hp 40g then you need to buy the cable separately.
If you are using an hp 39g+ then the cable connects to the USB port on your
computer. If you are using an hp 39g or an hp 40g then you will need to
purchase the cable and download the software from Hewlett-Packard's
website.
More information on this can be found on pages 200 - 226.
Calculator Tip
Search on the web using the key word "hp 39g" and you
will find a variety of sites which contain information and
aplets.
23