A method and computer system are provided for managing a host session on a remote computer. A request is sent to establish a host session from a client computer. The request includes a presentation space for displaying screen data. The client computer has access to properties files defining the screens for the host session. After the request is sent from the client computer, a response to the request is received in the presentation space from the remote computer. The response includes host screen data. Next, the response from the remote computer is identified by comparing the host screen data in the presentation space to screen data defined in one or more of the plurality of properties files for the host session. If host screen changes are detected during the host session, an error is generated and data associated with the error is presented to a user in an errors file. The user may then correct the error by modifying or updating the properties files associated with the host screens.