net481 
namespace System.Threading
{
    [ComVisible(false)]
    public sealed class Semaphore : WaitHandle
    {
        public static Semaphore OpenExisting(string name, SemaphoreRights rights);
    }
}
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.NET Framework
2.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

System , Version=4.0.0.0, PublicKeyToken=b77a5c561934e089

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The API is automatically referenced.

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