16-JUL-1995
The multihome extensions to the the HTTP server allow a single server process
to listen on multiple TCP/IP interfaces (multihomed hosts) and distinguish
which address the client connected to.  The syntax of the 'localaddress' rule
has been extended to allow the localaddress declaration to begin a block
of rules to be executed only for that address, effectively allowing you
to assigned different server roots based upon the domain name.

New localhost syntax (3 forms):

    LocalAddress dot-address
	Original format, no extenstions.  Forces server to listen for
	requests only on specified address.  Use HostName rule to specify
	string used for CGI SERVER_HOST variable.

    LocalAddress dot-address hostname
	Extended format.  Forces server to listen for requests to specifed
	address (interface), also begins block of address-specific rules.
	Scripts that use the <DNETHOST> and <DNETID> tags (includes CGI
	scripts) will be returned the hostname for the matching LocalAddress 
	block definition.

    LocalAddress
	Extended format (no arguments).  Terminates current block of
        address-specific rules, following rules will apply to all requests.

Example:
    #
    # Listen on multiple interfaces and assign different home pages.
    #
    LocalAddress 128.146.235.235 bogus1.com
    map / /www/bogus1_home.html
    map /www/ /www/bogus1_home.html

    LocalAddress 128.146.234.236 bogus2.com
    map / /www/bogus2_home.com
    map /www/ /www/bogus2_home.com
    # /htbin2 only accessible from URLS starting with http://bogus2.com/
    exec /htbin2/* sys$node::"0=WWWEXEC"usr2:[www.bin]"
    LocalAddress		# terminate address definitions.

To install the patches, unpack the multihome.zip file into the [.base_code]
directory of the version 1.9 source tree and rebuild.

Notes/restrictions:
    The tserver_tcp module has been changed to support the extensions,
    allowing multiple calls to ts_set_local_addr which builds a list of
    interface addresses to listen on.  Subsequent calls to ts_declare_tcp_port
    creates a separate thread to listen on each address, only the first
    created thread is returned in the control_thread argument.  The 
    management interface address must be the first localaddress declared,
    due to that being the returned control_thread.

    The client contexts managed by tserver_tcp.c are now pooled (each client
    context has a unique index 'n' which is displayed in the trace file
    as "TCP-80/n").

    The routine ts_tcp_info() in tserver_tcp.c was modified to return
    the local address rather than the remote address when the caller
    specifies a null argument for the remote_port pointer.