The problem comes when the icon that it defaults to for printing is a right load, but the only way that envelopes can be loaded is in the center of the tray. I have an HP Colorlaserjet 3600 and an HP Officejet Pro 8600 and both load this way.
A technical definition of a function is: a relation from a set of inputs to a set of possible outputs where each input is related to exactly one output.
An equivalent definition: A function (f) is a relation from a set A to a set B (denoted f: A B), such that for each element in the domain of A (Dom(A)), the f-relative set of A (f(A)) contains exactly one element. Some common functions (with discussions). 1  trig functions. 2  sine, sin(x).