Some Microsoft Dynamics AX users need to be able to quickly do certain actions without touching their mouse. An example would be an order entry user who needs to enter hundreds of orders in a single day. Any efficiency to their process via the keyboard becomes critical. People will utilize thwa they call 'hotkeys', 'keyboard shortcuts', 'quick keys', etc
If'you have custom objects or a specific flow and would like to control what these values are, use the 'KeyTip' property on the form controls as seen in Figure 2 below
It's pretty powerful functionality. I've been able to fully create a sales order, change a number of key fields, add a few lines and release it to warehouse in an incredibly short amount of time.
Hope it helps! Enjoy!