You could have downloaded CrossTec VueAlert 5.10.1 from our software library for free. The actual developer of the free program is CrossTec Corp. ClientDiscovery.exe is the common file name to indicate this program's installer. The program is included in Communication Tools. The most popular versions among the program users are 4.0, 2.1 and 2.0.
From the developer:
CrossTec VueAlert allows instant and reliable delivery of notifications and alerts across a LAN or WAN to both Windows and Mac desktops.
VueAlert provides a simple and effective method for administrators to instantly deliver key notifications to desktops across an enterprise, without concern for network topology, and to provide accurate records of message delivery and acknowledgement.
You may want to check out more software, such as WinPopup Speak, NetVoiz or LAN Chat, which might be similar to CrossTec VueAlert.