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Use XDISPLOC Telnet Option
Uses XDISPLOC Telnet option to pass display (PC X server) information to server. If you are using a PC X server such as Xmanager, use this option to execute remote X11 applications from a local PC.
Display
Enter the DISPLAY value to pass upon login. $PCADDR value is translated automatically to IP address of a local PC right before it is passed to server. The DISPLAY number must match the DISPLAY number of the X server currently running on the PC.
Option Negotiation
This option determines who initiates the attempt to negotiate additional TELNET options. When set to Active, after a connection has started, Xshell intiates the negotation. Passive waits for the server to intiate the negotiation. The values may have to be different depending on the server or firewall settings. If both the server and Xshell are set to Passive, the negotiation will not proceed. Conversely, if Active is selected and the firewall is enabled on the server, the negotiation may fail.
Force 'Character-at-a-time' mode
In most Telnet connections, the characters you type are sent directly to the server. Some Telnet servers that have problems negotiating options will also send the characters you type directly to the server if you turn this option on.