With RNS:: HBX you can launch over 16 applications with only 4 hard buttons of your Palm.
Now pressing each hard button pops up a window giving you choice to launch one of 4 previously selected applications. Additionally, you can assign 4 programs to the Calculator silk screen icon, and one per Up, Down and Center buttons. Furthermore, each Graffiti character (letter, number, etc.) or keyboard key may be assigned to one program.