This read-write string is a control object: setting it to a package name triggers the gateway to initiate a DOWNLOAD operation for that named package, kicking off the first phase of the package deployment lifecycle tracked by downloadStatus and related objects. Admins use this as the SNMP-based trigger to start pulling a new software package onto the network element. For example, an admin would SET this object to a specific firmware package name to begin downloading that package to the gateway, after which downloadStatus would reflect the transfer's progress.