The insert/overtype mode toggling is not global for the computer or even for a single application but rather local to the text input window in which the Insert key was pressed.
Wiktionary (0.00 / 0 votes) Rate this definition: high fructose corn syrup (Noun). Any of many corn syrups that has undergone an enzymatic processing to convert some of its glucose into fructose to produce a desired sweetness. Origin: high + fructose + corn syrup.
For our purposes, high fructose corn syrup (HFCS) and sucrose are the same thing because they're both highly sweet and they both contain a large amount of fructose. Sucrose is 50% fructose and HFCS is 55% fructose (which is high compared to normal corn syrup, but pretty normal when compared to cane sugar).