HP 430se - Manual (Page 44)

38 Hewlett-Packard Jornada 430/430se Palm-size PC
Some letters must be written in a particular way to be
recognized. To see how to write letters, tap the Help button for
an online demonstration or see Appendix A.
Drag your stylus across the panel horizontally from right to
left to delete a character. Drag from left to right to type a
space.
As you type or write, your P/PC anticipates the word you are
writing and displays it above the input panel. When you tap the
displayed word, it is inserted into your text at the insertion point.
The more you use your P/PC, the more words it learns to
anticipate.