Why does a letter make such a difference?

Question

This script works:
try
tell application "Safari"
activate
end tell
tell application "System Events"
tell process "Safari"
tell menu bar 1
tell menu bar item "history"
tell menu "history"
click menu item "reopen all windows from last session"
end tell
end tell
end tell
end tell
end tell
return true
on error error_message
return false
end try
But try changing the S in the second Safari in the process line to lower case and it won't work. (if you wanna experiment quit safari, and this script is all about bringing back the stuff you were looking at so don't worry about quitting).
Is there a good reason for this or should Apple change it?

Answer 1

I don't know if it's a good thing, but the fact is that process names are case-sensitive, so that two processes, respectively named "Safari" and "safari", could +in principle+ be running at the same time.
To be sure about that, I wrote a very short script that I saved as a stay-open application under the name "safari" and launched while the "Safari" browser was already running. Then I executed the following statement in the Script Editor:
*tell application "Finder" to return processes*
--> {…, application process "Safari" of application "Finder", application process "safari" of application "Finder", …}
Maybe you might find [this article|http://lambda-the-ultimate.org/node/1114] interesting.