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                        Net Bios Control Block (NCB) Format
     +------------------------------------------------------------------+
     |Off- |Size |  Field   |                Field                      |
     |set  |Bytes|  Name    |             Description                   |
     |-----+-----+----------+-------------------------------------------|
     | 00h |  1  | Command  | Net Bios command code.  High order bit    |
     |     |     |          | set indicates no-wait mode.               |
     |-----+-----+----------+-------------------------------------------|
     | 01h |  1  | RetCode  | Completion result.  Zero if no error.     |
     |-----+-----+----------+-------------------------------------------|
     | 02h |  1  | LSN      | Local session number (1 to 254). Returned |
     |     |     |          | by CALL and LISTEN, and supplied for      |
     |     |     |          | SEND and RECEIVE commands.                |
     |-----+-----+----------+-------------------------------------------|
     | 03h |  1  | Num      | Name Number (1 to 254). Returned by ADD   |
     |     |     |          | NAME commands, and supplied for RECEIVE   |
     |     |     |          | ANY and datagram commands.                |
     |-----+-----+----------+-------------------------------------------|
     | 04h |  4  | BufAdr   | Address of message for send and receive.  |
     |-----+-----+----------+-------------------------------------------|
     | 08h |  2  | BufLen   | Length of message buffer. For receive     |
     |     |     |          | commands, supply the maximum buffer size  |
     |     |     |          | and the actual length is returned.        |
     |-----+-----+----------+-------------------------------------------|
     | 0Ah | 16  | CallName | Name from/of remote machine for CALL,     |
     |     |     |          | LISTEN and datagrams.  For a CHAIN SEND   |
     |     |     |          | command, the first word specifies the     |
     |     |     |          | length of the second buffer, and the      |
     |     |     |          | next two words specify the address.       |
     |-----+-----+----------+-------------------------------------------|
     | 1Ah | 16  | Name     | Local name. Specifies name to add for ADD |
     |     |     |          | NAME, or name to use for other commands.  |
     |-----+-----+----------+-------------------------------------------|
     | 2Ah |  1  | RTO      | Receive time-out in .5 second increments. |
     |     |     |          | Supplied on CALL and LISTEN commands.     |
     |-----+-----+----------+-------------------------------------------|
     | 2Bh |  1  | STO      | Send time-out in .5 second increments.    |
     |     |     |          | Supplied on CALL and LISTEN commands.     |
     |-----+-----+----------+-------------------------------------------|
     | 2Ch |  4  | Post     | Address of user interrupt routine called  |
     |     |     |          | when command completes and no-wait mode   |
     |     |     |          | mode was specified in command code. Not   |
     |     |     |          | called if set to 0:0.                     |
     |-----+-----+----------+-------------------------------------------|
     | 30h |  1  | LANA_Num | Number of adapter card -- 0 for the first |
     |     |     |          | and 1 for the second, if applicable.      |
     |-----+-----+----------+-------------------------------------------|
     | 31h |  1  | CMD_Done | Command completed flag. A value of 0FFH   |
     |     |     |          | indicates the command has not completed.  |
     |     |     |          | When the command has completed, CMD_DONE  |
     |     |     |          | is set to same value as RETCODE.          |
     |-----+-----+----------+-------------------------------------------|
     | 32h | 14  | Reserved | Used internally by Net Bios.              |
     +------------------------------------------------------------------+