multi instance subprocess return value

Hi, 

Is there a way to get a return value from a multi instance sub process? 
E.g. I want the subprocess to return a true or false. 
If any iteration returns false I want the process to go one way, and if all return true - the other way. 
Or return a number which I can add later on in the process, so I get a sum of all the return values of each iteration?