Short: efun query_input_to() or query_input_pending()
From: Tomba@Batmud
Date: 2001-08-25
Type: Feature
State: New
See also: f-000530

query_input_to() returns the name of the function, or the closure
respectively, to which input_to() was set.

Fiona suggest to use query_input_pending() for this.
