I recently encountered a vague question on Stack Overflow which asked for instructions on a very basic operation in C++. I added an answer linking to a Google results page, which contained very easy tutorials as top hits, as well as linking a few of these hits directly.
The asker commented that he "tried these links but not of much help..!!" and I answered that "we can't really help you if you don't tell us what you tried and what went wrong".
At that point I felt compelled to link to The Old New Thing:
Is this acceptable? Or does it sound too rude? I want to give clear advice as to the uselessness of his question as it is without sounding too mean.