If you use the telnet built into BeOS to connect to machines on other platforms and are having trouble logging in, the reason is probably that Be’s telnet terminal type is set to „beterm.“ To fix it, try changing the TERM environment variable in the Terminal first:
export TERM=ansi (or TERM=vt100, or whatever works for you). You should also make sure the BeOS Terminal is set to use ISO Latin 1 encoding.