Test and Measurement task can be done without limit of time and space by PDA with virtual instrument technology.

将虚拟仪器技术应用于PDA（个人数字助理）中，可以利用PDA的优点，不受时间和空间的限制完成各种测试测量任务。

youdao

Assistant, but as far as we can tell it really just seems like a regular PDA with a slightly larger touchscreen and a slightly larger virtual keyboard that's designed to be used with your fingertips rather than a stylus.

ENGADGET: The Jackito Tactile Digital Assistant