Most people who ask questions are asking very specific questions, resulting in perhaps not the best answer possible. I'm going to take a guess that what you really want is a way for a macro to know if a user is "ready" for the next step. Here are a couple of different ways I go about that.
The first action waits until the user has done nothing for 60 seconds. I find this a good way for my macro to know if the user is "ready" (ie, not busy). Therefore no keystroke is required, instead the absence of keystroke and mouse movements trigger the macro to continue:
Another way with a slightly different effect is to insert the following statement from time to time inside my macros: (essentially the CAPS LOCK key becomes the equivalent of a PAUSE key).
Sometimes I find it helpful to tell the user that the program is pausing, like this:
I have a few other more complex macros that do something similar. For example I once made a macro that said "if the user's iPhone is within Wifi range of this computer then...". I also had one that allowed the user to speak to the computer to activate a macro or change a condition for macros to evaluate. I don't think you need those macros, but consider the ideas to be food for thought.