does the IPC event support adding slot dynamically by API

hi, 

  i want a API which support add/remove slot(for subprocess) dynamically in any time.

 for example:

   Activity A contains a IPC event, the IPC event will create some subprocess instances dynamically. after the activity A execute successfully and the subprocesses are created at the same time. but i want to  remove/add a subprocess instance after activity A executed.

Is there any API supports that action?

thanks!