# Package =TWiki::UI Service functions used by the UI packages
## [[StaticMethod]] **run** `(\&method,...)` Entry point for execution of a UI function. The parameter is a reference to the method. ... is a list of name-value pairs that define initial context identifiers that must be set during initPlugin. This set will be extended to include command\_line if the script is detected as being run outside the browser. ## [[StaticMethod]] **checkWebExists** `($session,$web,$topic,$op)` Check if the web exists. If it doesn't, will throw an oops exception. $op is the user operation being performed. ## [[StaticMethod]] **topicExists** `($session,$web,$topic,$op)=>boolean` Check if the given topic exists, throwing an [[OopsException]] if it doesn't. $op is the user operation being performed. ## [[StaticMethod]] **checkMirror** `($session,$web,$topic)` Checks if this web is a mirror web, throwing an [[OopsException]] if it is. ## [[StaticMethod]] **checkAccess** `($web,$topic,$mode,$user)` Check if the given mode of access by the given user to the given web.topic is permissible, throwing a TWiki::OopsException if not. ## [[StaticMethod]] \*readTemplateTopic `($session,$theTopicName) -> ($meta,$text)` Read a topic from the TWiki web, or if that fails from the current web.