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Visual Studio .NET 2003
The mode argument determines the action taken by the calling process before and during a spawn operation. The following values for mode are possible:
|_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.|