This is used to verify that someone has cookies enabled in their browser:

page 1:

[Cookie_Set:'test'=1234, Path='/'][Header]HTTP/1.1 302 found
Location: http://www.thedomain.com/cookies_test.lasso
Server: Lasso/5
[/Header]

page 2:

[If:(Cookie:'test')==1234]
 [Include:'cookies_enabled.lasso']
[Else]
 [Include:'no_cookies.lasso']
[/If]
