Awesome!! It pops up that box for every instance of a $proc that's found. Mission fully accomplished. Here's the code in it's final form:
Code:
$arraycomputers='@wksta','COMP1','COMP2','COMP3'
$processes='PROC1','PROC2','PROC3'
For Each $computer in $ArrayComputers
For Each $proc in $processes
If EnumProcess($proc, , $Computer)
$=SendMessage(@wksta,$computer +' is running '+ $proc)
EndIf
Next
Next

Thanks a ton to everyone who helped me, especially Radimus. I think I'm beginning to understand KiX a bit better after all of that.