Telnet: Under the Win2k Admin Tools menu, there's a program called Telnet Server Amin. This will set you Win2K box as a Telnet server. Not very secure but may do the job.
SSH: Haven't tried this one. You'll need to grab a third party product as MS don't supply anything by default (ASFAIK). OpenSSH?
VNC etc: As there's no X Windows environment installed by default with SME, none of these type of products will work installed on the server.
Regards,
Luke