title: Can OS processes share a single CPU stack?
body: <p>Can processes share a single stack?</p>
  
  <p>I'm currently thinking yes and no. That they "share" stack but it need to copy and save the information already there elsewere before using it and return it when the first process is getting picked up by the CPU again. But I might be confusing this with registers in general. 
  Can someone help me shed some light on this?</p>