... The %IF% construct gives TWiki the power to include content in topics based on the value of simple expressions. ... True if the current context is set (see below) . ... Compare TWiki variable You are %IF{ "$ WIKINAME='TWikiGuest' and not defined 'OPEN_DAY'" then="not" }% allowed to %IF{ "context view" then="view" else="edit"}% this TWiki today. ... Check access permissions You %IF{"'%TOPIC%' allows 'change'" then="can" else="cannot"}% change this topic. ... in attach script (see TWikiScripts ) . ...