Palm Treo 700WX User Manual page 276

Make sure that the third-party application supports 240x240 screen resolution.
Some older applications have screen-size limitations. Third-party applications
should also be written for Windows Mobile version 5.2 or later. Programs written
for earlier versions do not support 5-way navigation or Softkeys and can have
performance problems. If you can try a free version of the software before
purchasing it, you can test it first to make sure it works properly.
Tip:
Before purchasing a third-party program, try the free version.
260 Section 6A: Managing Files and Applications