What does the security shield mean??

What does the security shield mean thats appeared next to the short cut
symbol on my desktop icon? What is the significance of it? It appears on the
same application icon regardless of whether the user is nominally an
administrator or standard user..

When I run using the Admin account I get a "An unidentified program wants
acess to the computer" message.. Allow or Cancel.. select Allow and it runs
ok.. Is this running as Admin or Standard now??

When using a Standard user selecting the applications I get the same "An
unidentified program wants acess to the computer" message.. and I have to
enter an Admin password... it then runs ok

If in both senarios its running with elevated (Admin) permissions how do I
make my application run as a standard user so that the UAC fires the "An
unidentified program wants...yada" message with the Allow Cancel options
rather than having to enter the Admin password.

I guess I am missing something here.. so all help greatly appreciated.

Nick