The widget which acts as requestor
Which selection to get
Form of information desired (e.g., STRING)
Time of request (usually of triggering event) In emergency, you could use GDK_CURRENT_TIME
TRUE if requested succeeded. FALSE if we could not process request. (e.g., there was already a request in process for this widget).
Requests the contents of a selection. When received, a “selection-received” signal will be generated.