Sometimes wscript.shell's SendKeys method can be a little quirky, so if you run into problems, replace the fourth line above with this: Add-Type -AssemblyName System.Windows.
#Hammerspoon keystroke every few seconds password
IMPORTANT WARNING: Be extra careful if you're using this method to send a password, because activating a different window between invoking AppActivate and invoking SendKeys will cause the password to be sent to that different window in plain text!. 8 seconds has a significant failure rate. I find that on my 2.6 GHz Core i7 Win7 laptop, anything less than. Set timer, press start, click (wait a few seconds) enter, click (wait a few seconds) enter, etc. You can experiment with reducing the amount of time to find the minimum that's reliably sufficient on your system ( Sleep accepts decimals, so you could try. Be aware that this can be tripped up, if you type anything or click the mouse during the second that it's waiting, preventing to window you activate with AppActivate from being active. The reason for the Sleep 1 statement is to wait 1 second because it takes a moment for the window to activate, and if you invoke SendKeys immediately, it'll send the keys to the PowerShell window, or to nowhere. You can also use, though they're not identical - that's the keypad's ENTER key. The tilde (~) represents the ENTER keystroke. For example, you can view the hs. table, including the color definitions, by using the convenient hs. Color definitions are stored in Lua tables indexed by their name. To avoid ambiguity, you can have your script retitle its own window by using the title 'new window title' command. Several color collections are supported, including the OS X system collections and a few defined by Hammerspoon itself. If that interactive application is a PowerShell script, just use whatever is in the title bar of the PowerShell window as the argument to AppActivate (by default, the path to powershell.exe). $wshell.AppActivate('title of the application window') Make the timer automatically deactivate when the program I'm gonna use. Make the script happen 'behind the scenes', meaning it would send the key press to a certain program, even if it doesn't have focus. 
If I understand correctly, you want PowerShell to send the ENTER keystroke to some interactive application? $wshell = New-Object -ComObject wscript.shell I am hoping to make an AHK script that presses a certain key every X seconds, but I have no idea where to start with this.
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