A script for those moments when you can’t remember the creator code or bundle identifier of one of the applications you want to automate. 
It will list the codes for all the applications running on your system, and if you want, you can enter a search string (for part of the application name) to filter the list down.
It will also place a tell application id block (using the 4 letter creator code, or the longer bundle identifier) in the clipboard.
For various reasons, I am tending towards the creator code idiom these days. (Not least because some of the apps I use are now adding .appstore to the bundle identifiers of that subset of their builds …).
(Ver .04 below should be compatible with LaunchBar and Keyboard Maestro. Tap space bar to pass a search string to it directly from LaunchBar).
-- Get creator codes and bundle identifiers for tell applications blocks
-- (for applications currently running
-- Ver .05 Compatible with LaunchBar - select script, tap space bar and enter string in Launchbar
property pTitle : "Tell application id ..."
property pDefaultSearch : "dev"
property pCodeCopy : "Copy creator code"
property pBundleCopy : "Copy bundle identifier"
property pNameCopy : "Copy app name"
-- System Events
on run
tell application id "sevs"
activate
set strSearch to text returned of (display dialog "Enter part of application name:
(or leave blank to see all running applications)" default answer pDefaultSearch with title pTitle)
end tell
handle_string(strSearch)
end run
on handle_string(strSearch)
tell application id "sevs"
if (strSearch ≠ "") and (strSearch ≠ "*") then
set {lstCode, lstBundle, lstFile} to {creator type, bundle identifier, file} of (application processes where name contains strSearch and bundle identifier is not missing value)
set strPrompt to "Applications with \"" & strSearch & "\" in their name:"
else
set {lstCode, lstBundle, lstName, lstFile} to {creator type, bundle identifier, name, file} of (application processes where bundle identifier is not missing value)
set strPrompt to "All currently running applications:"
end if
repeat with i from 1 to length of lstCode
set varFile to item i of lstFile
if varFile ≠ missing value then
set strName to (name of item i of lstFile)
else
set strName to item i of lstName
end if
set item i of lstCode to item i of lstCode & "=" & item i of lstBundle & "=" & strName
end repeat
set my text item delimiters to linefeed
set strApps to lstCode as string
set lstApps to paragraphs of (do shell script "echo " & quoted form of strApps & " | sort -t '=' -k 3")
if length of lstApps > 0 then
set lstDefault to {first item of lstApps}
else
activate
display alert "No running apps have names matching " & strSearch
return
end if
activate
set varChoice to choose from list lstApps with prompt strPrompt default items lstDefault with title pTitle
if varChoice is false then return
set my text item delimiters to "="
set {strID, strBundle, strName} to text items 1 thru 3 of first item of varChoice
set {blnCode, blnBundle, blnName} to {true, true, true}
-- CREATOR CODE
if strID ≠ "????" then
set strCode to "tell application id \"" & strID & "\""
else
set blnCode to false
set strCode to strName & " has no creator code ..."
end if
-- BUNDLE IDENTIFIER
if strBundle ≠ "missing value" then
set strBundle to "tell application id \"" & strBundle & "\""
else
set blnBundle to false
set strBundle to strName & " has no bundle identifier"
end if
-- APPLICATION NAME
if strName ends with ".app" then
set strName to text 1 thru -5 of strName
set strAppName to "tell application \"" & strName & "\""
else
set blnName to false
set strAppName to ""
end if
set strChoice to "CREATOR CODE: " & strCode & "
BUNDLE IDENTIFIER: " & strBundle & "
APP NAME: " & strAppName
set lstBtns to {}
if blnName then set end of lstBtns to pNameCopy
if blnBundle then set end of lstBtns to pBundleCopy
if blnCode then set end of lstBtns to pCodeCopy
set lngButtons to length of lstBtns
if lngButtons > 0 then
set strClip to "-- " & strName & return
activate
set strBtn to (button returned of (display dialog strChoice buttons lstBtns default button lngButtons with title strName))
if strBtn = pCodeCopy then
set strClip to strClip & strCode
else if strBtn = pBundleCopy then
set strClip to strClip & strBundle
else
set strClip to strAppName
end if
set the clipboard to strClip & return & return & "end tell"
else
activate
display alert strName & " is not a scriptable process"
end if
set my text item delimiters to space
end tell
end handle_string
)