HP 39G User Manual page 234

MSGBOX
PROMPT
WAIT
15-28
Displays a message box containing textitem. A text item
consists of any number of expressions and quoted strings of
text. The expressions are evaluated and turned into strings of
text. For example,
"AREA IS:" 2+2 becomes AREA IS: 4. Use
to type the quote marks " ".
MSGBOX textitem:
Example
1 A:
MSGBOX "AREA IS: " *A^2:
You can also use the NoteText variable to provide text
arguments. This can be used to insert line breaks. For
example, press
NOTE
The position line
MSGBOX NoteText " "
will display the same message box as the previous example.
Displays an input box with name as the title, and prompts for
a value for name. name can only be one character in length.
PROMPT name
Halts program execution for the specified number of seconds.
WAIT seconds
and type AREA IS
*A^2:
Programming
CHARS
.