It can be done! Although slowly and with Windows...

Open "My Computer", then C:\, then WINDOWS, and finally CHARMAP.EXE. To "type", double-click each letter, hit copy, right-click a text entry and select "paste" in the contexual menu. Password entries will not let you paste, so use your browser's edit menu. Use File, Open to load webpages on browsers without a "go" button.

If you rely on Linux/ipchains to connect, Windows telnet will accept pasting! Just open some textfile for the crlf...

Update: It has come to my attention that you can do this much faster with xkeycaps. Telnet in, start X, export DISPLAY=:0 && xkeycaps & logout