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I know that the >= operator means more than or equal to, but I've seen => in some source code. What's the meaning of that operator? Here's the code: promiseTargetFile(fpParams, aSkipPrompt, Meaning if you have your own roll-your-own login process and never use HTTP Authentication, 403 is always the proper response and 401 should never be used. Detailed and In-Depth From RFC2616 10.4.2 401 Unauthorized The request requires user authentication. What is the meaning of 'is to be' in the following sentence and in similar cases? We cannot set up in any detail an ideal of character which is to be universally applicable. I wasn't able to find... What do single and double leading underscores before an object's name represent in Python?