These tools include voice, video, instant messaging (IM), Web conferencing, call management, directories, and "presence" applications that can constantly update user locations and availability.
这些工具包括语音，视频，即时消息(IM)，Web会议，呼叫管理，目录和“在场”的申请能够不断更新用户的位置和可用性。
These tools include voice, video, instant messaging (IM), Web conferencing, call management, directories, and "presence" applications that can constantly update user locations and availability.
这些工具包括语音，视频，即时消息(IM)，Web会议，呼叫管理，目录和“在场”的申请能够不断更新用户的位置和可用性。
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