Start another activity and return when closing

[vecino]

Hello, I have a question that is not answered:
How long can one activity and open another activity when you close the second activity continue running the program for the place where was I?
That is, something like a call to a "sub" and then "return"?, but "activitys"
Thanks and regards.

Sorry if not well understood, is translated with Google Translate

 

[vecino]

Hello, I've found, thanks.

 

[vecino]

With CallSubDelayed...