Again thanks for all of you for your quick & helpful responses.
Here is a summary:
Q. Running X remotely, let's say run application "admintool" under X from a
remote machine, and be able to display it on a local machine?
A.     You're at machine  A, running X (Solaris OpenWindows); want to add
use X applications on a machine B, let's say "admintool".
machine A :    Run  "xhost +hostB"  
               and             "rlogin  hostB"     or    "telnet  hostB"
machine B:     Run  "setenv  DISPLAY hostA:0"
                and       "admintool"           or   "admintool &"  to run
in background
The "admintool" application will run from B,  but will display window in A.
hostA  and hostB  are host names of the two machine.
hostA  and hostB  can be replaced by their IP addresses.
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