Check which instances are currently known by the listener

I am using oracle 10g on windows xp. How can i 开发者_运维技巧"check which instances are currently known by the listener"? I did googling over it and i found a method of checking, this method says use lsnrctl services <listener name> this but when i write lsnrctl services <LISTENER> command on command prompt i got "The syntax of command is incorrect" error.

Any idea please? kindly reply.

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You should just type in lsnrctl services and in case you know the name just the listenername without the angular brackets like lsnrctl services xe