Im looking into writing dll´s for online apps, anyone have an article on this or would know how to go about the basics of using dlls in online apps?

The use of "hacker" to mean "security breaker" is a confusion on the part of the mass media. We hackers refuse to recognize that meaning, and continue using the word to mean, "Someone who loves to program and enjoys being clever about it."
"Its not a bug, its a feature" (Epic Games)