Checking a method for parameter types via SEL

FROM : Tommy Nordgren
DATE : Mon Jul 31 20:23:38 2006

Can someone who have been using cocoa long please tell me how to do 
this?
The signature should be like this:
-(BOOL) aMethod: (id) owner;
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"Home is not where you are born, but where your heart finds peace" -
Tommy Nordgren, "The dying old crone"
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