Command SetKey :

Set the input string to the key of the metadata in the given index.

SetKey Definition
Input Argument	Tango::DEVVAR_LONGSTRINGARRAY	Index number and metadata key.
Output Argument	Tango::DEV_VOID
DisplayLevel	OPERATOR	..
Inherited	false	..
Abstract	false	..
Polling Period	Not polled	..
Command allowed for	All states	..