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Cursor (arrow) keys don't work in Seqed

The problem is that your terminal emulator is not sending the appropriate codes to helix, and thus your cursor key hits are not being interpreted properly.

Mac running NCSA Telnet
If you're running the latest version of NCSA Telnet, v 7.24b, you need to redefine your terminal emulation to vt100. In NCSA Telnet, go into the Preferences menu, then into Terminals, then into Change. Set the terminal emulation type to be vt100 (the 'answerback' string should also change to vt100). Now log in to helix and try seqed; the arrow keys should work.

If you're running an older version of NCSA Telnet, consider upgrading! You can get the later versions from NCSA's ftp site. If for some reason you're stuck with v2.5 or v 2.6, you can fake it out by redefining some keys to send the codes that GCG expects for the arrow keys, using the Macro feature of NCSA Telnet. For example, you can define the numeric keypad keys to correspond to the normal cursor key codes. Under the 'Edit' menu, select 'Set Macros'. Then define:
(AppleKey)2 to be \033OB   
(AppleKey)4 to be \033OD   
(AppleKey)6 to be \033OC
(AppleKey)8 to be \033OA
[Note in the above codes the first 0 is the number zero and the second is uppercase "o". And yes, you need the backslash.] To save these settings use the "Save Set" option under the "FILE" menu.....this will provide an icon which, when clicked on, will open a session with all your previously defined settings, including macros. Now, to type an up-arrow, you would type 'Apple-2', and for a left-arrow you would type 'Apple-4' etc. Use the numeric keypad on the right of your keyboard, not the number keys that are above your alphabet on the keyboard.

PC running NCSA Telnet
Try redefining the keys to send the codes that GCG expects for the arrow keys. In NCSA Telnet, under the "EDIT" menu, select "Set Macros". You may be able to define something like
        (Alt key) 2     \033OB
        (Alt key) 4     \033OD
        (Alt key) 6     \033OC
        (Alt key) 8     \033OA
(in the above codes the first 0 is the number zero, and the second is uppercase "o") You would then save these settings using the "Save Set" option under the FILE menu. Then, to use the cursor keys, you use "Alt"+numeric keypad 2, or Alt+numeric keypad 8 etc.

Unix machine
The keyboard has two sets of arrow keys -- one set immediately to the right of the letter keys and one set on the numeric keypad. If one set doesn't work, try the other.