For example:Process A create Process B and exchange messages between them.Once Process A found that Process B is gone, Process A will call "WaitForSingleObject" on Process B.The details about the function "WaitForSingleObject" is as follows: WaitForSingleObject(HANDLE hHandle, DWORD dwMilliseconds)If I set the dwMilliseconds to 0, On "windows 2003 server", "WaitForSingleObject" will return "WAIT_OBJECT_0" -- succeed.But on "windows 2003 server R2", "WaitForSingleObject" will return "WAIT_TIMEOUT" -- timeout.If I set the dwMilliseconds to 1000 on "2003 server R2", "WaitForSingleObject" will return "WAIT_OBJECT_0" too -- succeed.Some system behavior must have been changed between "2003 server" and "2003 server R2", but I can't find any official documents about this.Can anyone tell me something about this?Any suggestion is appreciated.Thanks very much.

Hi, According to the description, the issue seems to be related to development/coding. As we are mainly focus on the general question about Windows Server, for accurate answer to the question, it is recommend you to initial a new thread in the MSDN forum to get further support. MSDN forumhttp://social.msdn.microsoft.com/Forums/en-US/categories/ I have included a document for your reference WaitForSingleObject Functionhttp://msdn.microsoft.com/en-us/library/ms687032(VS.85).aspx Hope the issue will be resolved soon. This posting is provided "AS IS" with no warranties, and confers no rights.

Thanks very much.I will try it.