Transmit exists command...

I would like to know what the context is for the exists command in Transmit.

My goal is to connect to my ftp site and look in the root directory for a specific file. If it is there delete it.
Then another script runs some commands on my server. When that is done I want another script to run
with transmit to check for a specific file and download it.

Basically I am thinking that the exists command is what I need to use, but I do not know for sure.
I have looked through the dictionary and the context is very vague.

Thanks,
Carl

Model: MacBook Pro Core i7
AppleScript: 2.1.2
Browser: Safari 533.18.5
Operating System: Mac OS X (10.6)

I use transmit to download a file every 30 minss, After downloading I delete the file.

--set theServerAddress to "YourServerAddress"
--set theUserName to "YourUserName"
--set thePassword to "YourPassWord"
tell application "Transmit"
	set SuppressAppleScriptAlerts to true
	
	set theDocument to make new document with properties {name:theServerAddress}
	tell theDocument
		tell current session
			connect to theServerAddress as user theUserName with password thePassword
		end tell
	end tell
end tell
try
	
	tell application "Transmit"
		set SuppressAppleScriptAlerts to true
		tell document 1
			tell current session
				download item "ABC.txt" with resume mode replace
			end tell
		end tell
	end tell
	tell application "Transmit"
		set SuppressAppleScriptAlerts to true
		
		tell document 1
			tell current session
				delete remote item "ABC.txt"
			end tell
		end tell
	end tell
	tell application "Transmit"
		set SuppressAppleScriptAlerts to true
		quit
	end tell
end try

What version of Applescript are you using? I had to change that script quite a bit to get it to compile.

tell application "Transmit"
	set SuppressAppleScriptAlerts to true
	tell document 1
		download item at path "ABC.txt" with resume mode replace
	end tell
end tell
tell application "Transmit"
	set SuppressAppleScriptAlerts to true
	
	tell document 1
		delete item at path "ABC.txt"
	end tell
end tell
tell application "Transmit"
	set SuppressAppleScriptAlerts to true
	quit
end tell

Also, what would I do if I just wanted to grab files with the filename ending with abc? Say ***abc.txt? Or *************abc.txt? No matter how many characters are in front of the abc.