Abstract: Host multiple-byte character generator processing of guest keyboard events is blocked during applications sharing. A guest keyboard driver generates guest keyboard events which may be processed by any guest multiple-byte character generator. The guest events are transmitted to a host for use in shared applications. A patch instruction is written over a host storage queue which causes a jump to a patch subroutine when an attempt is made to deposit host keyboard events in the storage queue. Host keyboard events are marked by the patch subroutine and the marked host events are deposited in a shadow queue which is disposed in parallel with the host storage queue. Guest events also are deposited in the shadow queue. Untranslated host and single-byte character guest events, are stored in the host storage queue. When a shared application requires data from the host storage queue, the outgoing event is examined for origin, such as by examining the shadow queue.