SetVar and current documentation

Hello

Asterisk 1.4.0.
In documentation (pdf) i found SetVar() application.
But it’s not availablein my asterisk:
Mar 21 12:31:11] WARNING[32513]: pbx.c:1755 pbx_extension_helper: No application ‘SetVar’ for extension (numberplan-custom-1, 005, 1)

Where can i find (if) current documentation ?
What function could i use insted of SetVar ?

Thanx

use “Set” … SetVar was deprecated in 1.2 and removed from 1.4