Letter case is the distinction between the letters that are in upper case and lower case in the written representation of certain languages. The two case variants have the same name and pronunciation and are treated identically when sorting in alphabetical order. In English, capital letters are used as the first letter of a sentence, a proper noun, or a proper adjective. Other words normally start with a lower-case letter.
Some proper nouns are not capitalized. Two common examples are eBay and iPod. The Chicago Manual of Style has a suggestion for this case:
Brand names or names of companies that are spelled with a lowercase initial letter followed by a capital letter (eBay, iPod, iPhone, etc.) need not be capitalized at the beginning of a sentence or heading, though some editors may prefer to reword.
yoursunny has pushed this idea further. His username is always spelled in lowercase as yoursunny. It should not be written as
Yoursunny, yourSunny, YourSunny, etc. Also, there's no space in between.
Computers normally distinguish between upper case and lower case letters. In Unicode, upper case G has code point U+0047, lower case g has code point U+0067. In most programming languages, the string comparison operator considers "Georick402" not equal to "georick402".
In most database systems, a filtering query on a string column requires the query string to have the same letter case as the stored data. For example, running the query SELECT * FROM geocache INNER JOIN user ON geocache.ownerCode=user.referenceCode WHERE geocache.geocacheType=2 AND user.username='georick402' on the Geocaching database would return zero rows. Consequently, anyone can claim he/she/they have found all of georick402's traditional caches, without going out of the house even once!
Cache is not at posted coordinates. You should get off the bus at posted coordinates. Final coordinates are given in this ASCII art. Programming is not required to solve this puzzle.