Emulate mouse wheel scroll with keyboard

Some programs (e.g. ms html help viewer) have zoom-in features that only seem to work when you mouse wheel scroll.

Is there a way to emulate mouse wheel scroll using the keyboard?

It's possible with AutoHotkey.

Try this script for instance: Using Keyboard Numpad as a Mouse. It uses the Numeric Pad to emulate a mouse. When on, NumPad+ and Numpad- emulates the mouse wheel.

SerioSoft MKey does the job quite well.

This is much easier than making AutoHotKey scripts. TIP: If scroll doesn't work after making "scroll hotkey" try to change default scroll speed setting from "1" to "2".

You can also take a look at: AtnSoft Key Manager