Here is a list of Empire client capabilities.  This list is archived in
  ftp.empire.net:/pub/empire/player/docs/clients.txt


[1:512] Command : show client capabilities


                Mult Vis Tools Compat Readline System   History Int Aliases #
                     HMU       2ATH   RPE      ROAPECIS HLC     IRS AVMCRP  32
win3_b                                           X                           1
MEC                                    XX                                    2
TkEmpire1.0                             X      XXXXX                         6
wsemp102        X    ?X        XX              X X X    XX                   9
xemp5.1d             XXX X     XX              X        XX        X         10
lafe                 ?         XX     XXX      X  XX X  X X                 11
empclient2.5b        X         XX              XXXXX XX         XX          12
VMS client           ?         XX      XX      X X X XX         XXX X?? X   14
myxec0.2             ?XX              XXX      XXXXXXXX XX          XXX X   19
genie-0.2             XX              XXX      XXXX   X XXX     XX  XXXXXX  20
eif2.5          X    X         X      XXX      X XXXXXX XXX     X   XXXXXX  23
esh.0.0.3            X         XX     XXX      X XX  XX XXX     XXX XXXXXX  23
pei1.8          X        X            XXX      XXXXXXXX XXX     X X XXXXXX  24
pei2.3          X    X   X     XX              XXXXXXXX XXX     XXX XXXXXX  25


The meanings of the headers are:

Mult:
It is possible to be connected to more than one game at once.

Vis (Visualization):
H - the output of the "sect" command is highlighted correctly
M - the client has a special map display window
U - the map window is automatically updated as new data comes in

Tools:
Contains tools like autofeed, civmover, autoexplore, lneweff, database
of enemy sectors & units, reading/sending telegrams, production deltas.

Compat (Server Compatability):
2 - Displays Empire2 messages without error
A - Displays Empire2 messages (inform/flash) as they arrive ("asynchronously")
T - Uses the EmpireToolkit (not released yet)
H - Uses the EmpireHub (not released yet)

Readline:
R - Complete readline support
P - One key (e.g. ^P or cursor-up) recalls previous command
E - Various keys (e.g. ^B and ^D or cursor-back and delete) can be
    used to edit the command before it is sent.

System:
R - File redirection.  e.g. cen * > cenfile
O - Redirection doesn't overwrite.  i.e. must use cen * >! cenfile if
    cenfile already exists
A - File append.  e.g. cen * >> cenfile
P - Pipes.  e.g. news | more
E - Can execute scripts.  e.g. exec commandfile
C - Can process commands from the output of a program.  e.g. runfeed civmover
I - Program can take input from a file.  e.g. emp_client < commandfile
S - Can execute shell commands from within the client.  e.g. shell ls *.tar

History:
H - The client keeps a list of previous commands the player typed.
L - It is possible to view this list.
C - The csh convention (!!, !abc, ^a^b) can be used to recall/modify
    previous commands

Int (Interrupt handling):
I - The client will abort the current command when the player hits an interrupt
    key (e.g. ^C).
R - The client resynchronizes with the server after an interrupt.
S - Two consecutive interrupts shuts down the client.

Aliases:
A - It is possible to define aliases (macros) e.g. alias c1 cen #1
V - Aliases can include variables e.g. alias cx "cen #$1"
M - Aliases can contain multiple commands e.g. alias cl1 "cen #1; lev #1"
C - Conditional aliases are supported.  i.e. an alias like
    alias n1 "nav 1 j; ?j; ?u; ?h" will only send commands beginning
    with "?" to the server if the server is at a sub-prompt--otherwise
    the command is ignored.
R - Can have file redirection within an alias.  e.g. alias dd "dump * > dfile"
P - Can have a pipe in an alias.  e.g. alias po "power | more"

#:
This is the total number of X's in the row.  This number mostly
represents how closely the client resembles the popular shell program
"tcsh".

Ken Stevens
children@empire.net