Is there something like xinput but for output instead

I just found out that you can use xinput to sniff key strokes across apps running on X

Is there something similar but to output data to whatever app has the focus now?

I would like to implement something like an autocomplete or smart suggestion program that listens for your keystrokes across applications and makes smart suggestion

e.g listen to whatever ha开发者_如何学JAVAppens on the browser then if you switch to terminal or your text editor you can reuse some of that data.

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You can send keyboard events to an X application using XSendEvent or the XTEST extension. XTEST is significantly more powerful, but in many cases it has to be manually enabled in the X server configuration. See also this and this for more information and some sample code.

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uinput