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  Constant:  P_OVERLAY, P_NOWAIT, P_NOWAITO, P_WAIT, P_DETACH
 
  Include:   <process.h>
 
  Context:   spawn family of functions
 
  Synopsis:  The <modeflag> argument determines the action taken by the
             parent process before and during spawn.
 
     The following values for <modeflag> are possible:
 
     Constant      Meaning
 
     P_OVERLAY     Overlays parent process with child, destroying the
                   parent (same effect as exec calls).
 
     P_NOWAIT      Continues to execute parent process concurrently
                   with child process (asynchronous spawn──valid only
                   in protected mode).
 
     P_NOWAITO     Continues to execute parent process and ignores wait
                   and cwait calls against child process (asynchronous
                   spawn──valid only in protected mode).
 
     P_WAIT        Suspends parent process until execution of child
                   process is complete (synchronous spawn).
 
     P_DETACH      Continues to execute parent process concurrently
                   with child process. Child process is detached from
                   parent's process hierarchy; if parent process is
                   terminated, the child process continues to run
                   (asynchronous spawn──valid in protected mode only).