How to know number of databases running

HI Experts,
How to easily know how many databases are running in Windows OS and Solaris OS
Thanks
Shaan

Hi Adith,
It means i have to loggin to sqlplus, but even if i logging to sqlplus it won't show total numbers of databases running on the server. Is there any other way to know.
My query is how do I know about number and name of the databases running on a server which is unknown to me. Lsnrctl is one option, but it also doesn't give the 100% result.
Thanks
Shaan

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