39b60f75_r_System_Administrator_s_Guide__Description
[Type] EXTRA_SELECTION_LIST [Arg 1] Specifies the list of available options using the PHP array function [Arg 2] 0 indicates single selection, 1 indicates multiple selection and also the maximum size [Description] 
Presents the user with a selection list (single selection) to choose from
WebCalendar System Administrator's Guide
Description