How does Sendkeys work, which values to use with combination keys in Katalon Recorder

In Katalon Recorder I would like to e.g. go to a previous page in the browser.
I would like to do that by sending the command: ALT-Leftbutton.
I do see the sendKeys command but how does it work? What kind of input do I provide it? Also combination keys like CTRL-A, ALT-ENTER, SHIFT-Left. I’m unable to find it in the documentation.

In short: I want to send the command: ALT-Left to the browser (to go to a previous page). What do I enter in Command, Target and Value?