How many instances does EM support

dear experts,
I am using EMCTL and it opens one of my database instances ie. oracle2. but what if I want to open anthoer database instance? I tried to open another database instance, but my first instance was logged out. kindly tell me how many instances can simultaneously be opened?

You can setup grid control for either RAC or single instance databases. Setting up a grid control is not something that can be detailed in a single post, so I suggest you to refer to this manual -->
Oracle® Enterprise Manager Grid Control Installation and Basic Configuration
10g Release 3 (10.2.0.3.0)
Part Number B40103-01
~ Madrid

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