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.

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