with a variable :
[var.user;if [val]='';'you are not logged in';else 'welcome [val]']
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var.* fields are merged automatically with Php variables.
You also can define a php variable $user_info to display.
And you also can use conditional blocks. They works like a switch statement. There is an example of conditional blocks in the example set (at the web site or given with the TBS package).