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Have you read the manual? you can download the users manual and a CHM version here: http://kixtart.org/downloads.html

This is the explanation of READVALUE():

ReadValue( )

Action
Reads the value of a registry entry.

Syntax
READVALUE ("subkey", "entry")

Parameters
Subkey : Identifies the subkey containing the entry.

Entry : Identifies the entry whose value you want to discover. To read the default entry of a key, specify an empty string as the entry name.

Returns
0 Function returns ASCII representation of the specified registry entry
Error code Function failed