F9 function
Who can I use f9 function on my iPad 2 without other additional machine?
iPad 2
Your wording is not completely clear. I'm assuming you're accessing a system that's requesting your press the "F9" key. If so, then that capability is dependant on the app you're using. For example, if apps that emulate a VT100 terminal will provide the funtion keys on screen. And apps that provide Remote Desktop for Windows will also provide function keys.