A user just pushes the center button on the Palm and then flips through open apps and clicks one.

用户只需按下Palm的中间按键，然后在打开的应用中翻转并点击某一个即可。

youdao

Need not, the megalopolis of palm is very painful, pull to migrate to all feel uneasy for a while for a while, UGG Bailey Button Triplet, simply don't wash, sleep so.

不用，手心痛得很，扯一下动一下都觉得不舒服，干脆不洗了，就这么睡吧。

youdao

The entire top of the mouse is a button, allowing you to click by simply applying pressure with your palm -- a boon for people who have concerns about the ergonomic correctness of using a single finger to click.

CNN: Review: Apple Pro Mouse

An active palm rest rounds out the modules, with a thumb-wheel and additional action button -- it's joined by a pair of (yet again) adjustable wrist rests that anchor along the bottom edge.

ENGADGET: Mad Catz S.T.R.I.K.E. 7 gaming keyboard announced at Gamescom (hands-on)