WCF and many same singleton objects

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WCF

Hi,

My problem is hosting multiple instances of same singleton pair contract / object instantiated in one single windows service. Currently is not possible separate istance data and a modification on one has repercussions on all parallel instances. Is possible hosting in a single windows service many sinleton with same contract / Singleton keeping shared data separate between the n instances? I test also an AppDomain solution but nothing happens.

Thanks