There are 4 files that make up the SMB protocol specs (they are
not pur ascii, they have some formatting characters in them
for any standard line printer):

1) COREP.TXT is the orginal core protocol developed for MSnet and PCLP.
It is the common protocol (ie least common denominator) spoken
by any SMB server (ie MSnet, Lan Manager, VMS SMB servers, XenixNet,
etc).

2) DOSEXTP.TXT is the LM 1.0 SMB protocol.

3) SMB.TXT is the LM 2.0 protocol.  Note: In the doc is calls
LM 2.0 as LM 1.2 (it's orginal name before being renamed to 
LM 2.0).

4) XEXTNP.TXT is the XenixNet SMB protocol.

Happy reading.