#include <process.h>
Remarks
The mode argument determines the action taken by the calling process before and during a spawn operation. The following values for mode are possible:
| Constant | Meaning |
| _P_OVERLAY | Overlays calling process with new process, destroying calling process (same effect as _exec calls). |
| _P_WAIT | Suspends calling thread until execution of new process is complete (synchronous _spawn). |
| _P_NOWAIT or _P_NOWAITO | Continues to execute calling process concurrently with new process (asynchronous _spawn, valid only in 32-bit Windows applications). |
| _P_DETACH | Continues to execute calling process; new process is run in background with no access to console or keyboard. Calls to _cwait against new process will fail. This is an asynchronous _spawn and is valid only in 32-bit Windows applications. |
See Also _spawn Functions