At least here, ...
tell application "Skype"
send command "CALL xxx" script name "yyy" -- Where 'xxx' is a valid 'Skype' account, and 'yyy' can be anything.
end tell
... does launch 'Skype'; but also, presents the 'Skype API Security' window.
Clicking on the 'Skype API Security' windows' 'Allow this application to use Skype' radio button, and then the 'OK' button - will enter 'AppleScript' into a secured list.
However, the next time you execute the above code, the same ridiculous set of events occur.
---
To remove the presence of the 'Skype API Security' window, I use ...
tell application "Skype"
activate
repeat until ((name of window 1) contains "-")
delay 0.1
end repeat
send command "CALL hansgruber" script name "Hallo"
end tell
... You will have to replace 'hansgruber' with the grandfathers' 'Skype' account name or number.
---
'Script Editor' (in the '/Applications/AppleScript/' folder):
01. Launch 'Script Editor'.
02. Enter (copy and then paste) the above, second version, of AppleScript code into the 'Untitled' window.
03. Select the 'File, Save As...' menu item. A drop down sheet will appear.
04. Select 'application' from the popup menu.
05. Enter a name in the 'Save As:' textedit field. For example, I chose 'HansGruber'.
06. Determine the destination of the application.
07. Click on the 'Save' button.
'Automator' (in the '/Applications/' folder):
01. Launch 'Automator'.
02. Click on 'Automator' in the 'Library' column.
03. Double click on 'Run AppleScript' in the 'Action' column.
04. Replace ...
(* Your script goes here *)
... in the ...
on run {input, parameters} ... end run
... code with the above, second version, of AppleScript code (with respective change).
05. Select the 'File, Save As...' menu item. A drop down sheet will appear.
06. Select 'Application' from the 'File Format:' popup menu.
07. Enter a name in the 'Save As:' textedit field. For example, I chose 'HansGruber'.
08. Determine the destination of the application.
09. Click on the 'Save' button.