Citrix Corp's Provisioning Services software, based on the technology of application streaming, can allow the client, using PXE technology, dbtain the server operating system minoring files stored by Vdisk disk and diskless booting. XenAppsoftware, based on the technology of application virtualization, is also leased by Citrix Company. Though this software, a client can access a thin procedure provided by the server. The created LAN application environment both mutual union, may not only save the software and hardware cost, but also allow for the management of LAN environment to become easier to use and safe. In addition, applications run on the client can be specified, and the accessing server is not restricted to the internal LAN.