OT -- AppleScript Help

[Sivakatirswami]

Bruce Robertson wrote:
> It is best practice to eliminate tell statements where they are not 
> required.
>
> Finder is not necessary for this command.
>
> choose folder
> set f to result

It does not affect anything: result is the same with or without "tell" 
on a folder selection

alias "Varuna:Ekadanta Kulam:Database:EMBs:733:"

then an attempt

tell application "Finder"
  open alias "Varuna:Ekadanta Kulam:Database:EMBs:733:"
end tell

fails: result: "missing value"

Oddly though, "reveal" works....

tell application "Finder"
    reveal alias "Varuna:Ekadanta Kulam:Database:EMBs:733:"
end tell

why not "open"  ??