He wanted something local? Did you look at his example?
Code:
const £CHUNK_SIZE = 4096
Alias SendFile {  
var %filename = $+(",$1-,"), %chunksize = £CHUNK_SIZE  ;do stuff here
}

That doesn't look local to me. Constants are almost never local. Think about it. You probably want a SCRIPT_VERSION constant right? You want to have to do const SCRIPT_VERSION = 1.0 in EVERY alias? If you had to do that, it defeats the purpose of a constant (change one value and it changes everywhere it is used). SCRIPT_VERSION would likely be defined at the top of your script and then all aliases have access to it. There is virtually no reason to have a local constant.