Return value?

Hi,

How can I set the return value of my installer?
Quit and Abort both can't take return values as far as I know.
I'm launching my installer from another applicatio and need different return values

  StrCmp ${PREVIOUS_VERSION} "" noUpgrade

    MessageBox MB_YESNO "Setup will remove the following Products: $\r$\n ${PREVIOUS_VERSION} $\r$\n Press Yes to continue." /SD IDYES IDNO exitUpgrade

    MessageBox MB_OK "Removing..."

    ; here i need to return 0 

    

  exitUpgrade:

    Quit  ; here i return an error 

  

  noUpgrade:



 

Regards,
EnCey

SetErrorLevel

Thanks!