How can I ascertain which machine a user is currently using?

A. To identify which machine a particular user is using, you can run a series of commands (and even create a script to automate this process) by performing the following steps:

  1. Open a command prompt--go to Start, Run, and type
    cmd.exe
  2. Type
    nbtstat -R
    to purge and reload the remote cache name table.
  3. Type
    net send  .
    to send the user a period (.) for a message.
  4. Type
    nbtstat -c
    to list the cache of recently used names and IP addresses so you can identify the entry for the user you're communicating with.
  5. Type
    nbtstat -A 
    to equate the user's IP address to the machine name.

For example, to locate a user named Kevin, I performed the following series of commands and received the indicated responses:

   C:\>nbtstat -R
   Successful purge and preload of the NBT Remote Cache Name Table.

   C:\>net send kevin .
   The message was successfully sent to KEVIN.

   C:\>nbtstat -c
   Local Area Connection:
   Node IpAddress: \[200.200.200.5\] Scope Id: \[\]

   NetBIOS Remote Cache Name Table

   Name Type Host Address Life \[sec\]
   ------------------------------------------------------------
   KEVIN  UNIQUE 200.200.200.3 597

   C:\>nbtstat -A 200.200.200.3
   Local Area Connection:
   Node IpAddress: \[200.200.200.5\] Scope Id: \[\]

   NetBIOS Remote Machine Name Table

   Name Type Status
   ---------------------------------------------
   WORKST2  UNIQUE Registered
   SAVILLTECH  GROUP Registered
   WORKST2  UNIQUE Registered
   WORKST2  UNIQUE Registered
   SAVILLTECH  GROUP Registered
   WORKST2  UNIQUE Registered
   WORKST2  UNIQUE Registered
   KEVIN  UNIQUE Registered

   MAC Address = 00-08-C3-8F-0D-83
From this information, I discovered that Kevin is using machine WORKST2 at IP address 200.200.200.3.
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