Abstract: Systems and techniques are provided for providing access to one or more execution environments. For example, a process can include receiving a listen call from a first virtual machine (VM) and registering a listener call context of the first VM with a callback service of a trusted execution environment (TEE). A return code indicating no callback requests are available causes the first VM to put the listener call context to sleep. A call from a second VM raises a service request for a VM service of the first VM. A wake return code to the second VM wakes the listener call context of the first VM. A callback request transmitted to the VM service of the first VM corresponds to the service request raised by the second VM. A response call received from the VM service of the first VM is indicative of a callback response to the callback request.

Abstract: A method and apparatus that displays at least one user interface display image including patient parameter data is provided. An acquisition processor selectively acquires, from a storage repository, at least one type of patient medical parameter data associated with at least one patient acquired over a period of time. A display processor generates a display including at least one display image representing at least a portion of the acquired patient medical parameter data and a navigation bar associated with the at least one display image including a user selectable window identifying a range of acquired patient medical parameter data to be displayed within the display image. A controller is electrically coupled to the acquisition processor and the display processor. The controller controls navigating through the patient medical parameter data and adjustment of the user selectable window, and causes the display processor to modify the generated at least one display image.