lock directory

Where does modern xemacs put lock files (for clash detection)? I have 21.4.10 installed on linux and on cygwin. On linux I found /var/lock/xemacs, but it doesn't seem to be used. On cygwin I can't find it. INSTALL says: `statedir' indicates where to put architecture-independent data files that XEmacs modifies while it runs; it defaults to /usr/local/lib as well. We create the following subdirectories under `statedir': - `xemacs/lock', containing files indicating who is editing what, so XEmacs can detect editing clashes between users. I believe this is outdated? This all began because I was having trouble with a lock when I try to edit a file using xemacs running on linux, with the actual file on a win2000 system exported via cifs (smb).