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I tend to be discrete. I have found that if I refer to my PRINCE2 manual and someone sees me, there are three consequences:
a) the tosser will make a sarcastic comment: "I thought you were qualified?";
b) it will go missing within one day and appear on or even in that same tosser's desk;
c) that tosser will pester me until the end of the contract with "give us a lend of your manual".
I now keep a .PDF of the manual on my desktop rather than the paper on in my desk. My other reference material I keep at home to stop it being pinched.
I do a quick Google to look up obscure, and even not so obscure, function parameters, even if I'm 95% sure I remember them. Getting it right first time saves a lot of time. So it's well worth it.
It partly depends on what you're working with. Some systems like Visual Studio are more helpful with routine stuff like parameters and methods. But perldoc isn't always so helpful.
It's about getting the job done, not showing off your trainspotter memory for a myriad details.
It is probably like asking a writer to get by without using a dictionary.
If you add up all the functions from the the libraries, frameworks and languages I use then it probably equals the amount of words in the English language.