Setting up the CP special message device driver
Configure the CP special message device driver through
the smsgiucv_app.sender= kernel parameter or through
the sender= module parameter.
The z/VM® user ID does not require special authorizations to receive CP special messages. CP special messages can be issued from the local z/VM guest virtual machine or from other guest virtual machines. You can issue special messages from Linux® or from a CMS or CP session.