How to press a key using an alias
From Scriptwiki
With this alias, you are able to "send keys" to the active window, which doesnt have to be mIRC. For descriptions of all the keys, see: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/script56/html/wsmthsendkeys.asp
You will have to paste this script into the 'Remote' section of mIRC's script editor.
alias sendkey { set -l %name sendkeys $+ $ticks .comopen %name WScript.Shell .comclose %name $com(%name,SendKeys,3,bstr,$1-) }
Example
/sendkey {F1}
This sends the F1-Key to the active window (using the alias specified above).