[V8i SS3 in MX] Key-in for run an Input File

Hello,

I'm a very new to MicroStation key-ins and need a hand with it. I need a key-in for auto-running last used inpud file. I can assign it to key shortcut, I also know it should start with:

mxfile input

but after that, it still needs "enter" to be hit or "open" button to be clicked. Is there any possibility to implement such "enter" at the end of key-in command? I was suggested on other forum to use ";" or "; null" at the end of key-in command but it doesn't work.

Best regards
Aleksander Zamorski