I like using links to the IDL online help when posting to
comp.lang.idl-pvwave, but it’s often hard to find the link that corresponds to the online help page I’m viewing in the IDL Assistant. You can use some of the advanced features of your favorite search engine to narrow a normal web search down to just the IDL online help, but that’s a lot of typing for getting a simple link. So I made a “Custom Google Search” that searches only the online help for IDL. Check it out in the sidebar on the right.