Lending target device resources to host device computing environment

Various models may enable a first device to share a device resource with a second device in various contexts, such as sharing computing sessions via terminal services; sharing displays via display mirroring; and sharing input components across devices. However, such techniques often utilize ad hoc sharing models that depend on configuration and/or administrative access of each device; limit the capabilities of such sharing; and/or exhibit security concerns. Instead, a target device may advertise an availability of a target device resource. A host device may request the target device to lend the target device resource to the computing environment of the host device. The target device may reserve the target device resource for the host device, which may then integrate the target device resource into the host computing environment. The model may enable the user to utilize resources even from target devices that the user is not otherwise permitted to use.