|Kind of wonder how old that is if it let's you telnet in.|
I would still consider any 3270 to work with an IBM system and IBM program.
Kind of depends on a few things. You might try ctrl-a to work as an alt key. Assumes a lot of stuff.
Might have to map keyboard. See techet for map key telnet.
See this from IBM news.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, Make an autorun.inf folder on all usb drives.