Transporting local OS environment varibles to host system.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In Telnet protocol are options OLD_ENVIROMENT(36) a NEW_ENVIRONMET(39), for
transporting environment variables. SemTel implements both options approximately
as says rfc listed at end of this document.
In mentioned documents are defined two groups of variables:
        * Well known variables, called VAR:
                 - USER
                 - JOB
                 - ACCT
                 - PRINTER
                 - SYSTEMTYPE
                 - DISPLAY
        * User definabled, called USERVAR.

USERVAR is security week because allow user to modify varibles set by system
administrator, for example paths ... Lots of telnet damons refusing USERVAR.

Variables for transport should be selected in window 'Connection parameters'.

SemTel has three ways for enter varibles:
        1. Direct - static VARIABLE_NAME=VARIABLE_VALUE
        2. In dependent on OS environement VARIABLE_NAME=%OS_ENV_VARIABLE_NAME%
        3. In dependent on SemTelu VARIABLE_NAME=%SEMTEL_ENV_VARIABLE_NAME%
           For this point is avaiable only SEMTEL_LOCAL_IP. This variable
           contains FIRST IP address of computer.

Example:
   USER=smith
   SYSTEMTYPE=Win32
   LOCAL_PATH=%PATH%
   LOCAL_TEMP=%TEMP%
   LOCAL_IP=%SEMTEL_LOCAL_IP%

Host system will receive:
        * User name, user will be promted only for password
        * SYSTEMTYPE
        * Content of DOS/WinNT variables PATH and TEMP
        * FIRST IP address of computer where is SemTel running 


Reference:

  rfc1572 Telnet Environment Option. S. Alexander. January 1994. (Format:
          TXT=14676 bytes) (Status: PROPOSED STANDARD)
  rfc1571 Telnet Environment Option Interoperability Issues. D. Borman.
          January 1994. (Format: TXT=8117 bytes) (Updates RFC1408) (Status:
          INFORMATIONAL)
  rfc1408 Telnet Environment Option. D. Borman, Editor. January 1993.
          (Format: TXT=13936 bytes) (Updated by RFC1571) (Status: HISTORIC)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Document version : 0.900
Last change      : 18.8.1998
