How is Help browser started?

The items in the Help Menu start "your default browser" to display the 
help.  How is that accomplished?  I ask because it does not work for 
me.  If I start Abiword in a terminal I get the message 'Warning: 
Operation Not Supported' when I click the Help menu -> Help Contents.  
This is in Puppy Linux which is not standard in many ways--to get the 
Help working in one program, I needed a file named 'sensible-browser' to 
start the default browser.  Thanks for any help.  (Sorry if this is a 
duplicate--I sent one before I was authorized I think.)

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