HOW TO display a simple line of text if the user isn't logged in and not display it if they are?!?!?

there must be a way to display a simple line of text (or a link) if the user isn't logged in (as wholesale customer), and not display it if they are?!?!?

it's a basic kind of <php echo> var type of function.... there must be an equivalent in this BC system..... anyone?!?!?     PLEASE!

thank you

Chris.