$fromeditbox returns $true or $false depending on if the alias was called from a mIRC editbox
define the alias testedit:
alias testedit echo -a $fromeditbox
//echo -a $fromeditbox | testedit
Added: mIRC v7.52
Added on: 28 Feb 2018
Note: Unless otherwise stated, this was the date of original functionality.
Further enhancements may have been made in later versions.