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.
In mathematics, a function is defined as a relationship between defined values and one or more variables. For example, a simple math function may be: y = 2x. In this example, the relationship of y to x is that y is twice as much as the value assigned to x. While math functions can be far more complex than this, most are simple relative to functions used in computer programming. This may be why math functions are often referred to as expressions, while computer functions are often called procedures or subroutines. Computer functions are similar to math functions in that they may reference parameters, which are passed, or input into the function. If the example above were written as a computer function, x would be the input parameter and y would be the resulting output value. It might look something like this: function double(x) { $y = 2 * x; return $y;}