$IF -loggedin$ checks whether or not the user is logged into iService when loading the form. This is most often used when constructing a login panel for forms that require an agent login.
A simple example of $IF -loggedin$ is shown below.
$if -loggedin$ <- Checks to see if user is logged in
Welcome $value -loggedin(name)$! <- If user is logged in, we display their name from iService
$else$ <- If user is not logged in we ask them to enter their login details
Please login:<br />
LoginName: $loginname -id'loginname'$<br /> <- Ask user to enter their login
Login Password: $loginpassword -id'loginpassword'$<br /> <- Ask for user’s password
$endif$ <- Marks the end of the IF statement
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