OK then....
As I stated in my previous reply, since you
are connecting via the Internet, you are
most probably using "telnet". The fact that you
are using the "HyperTerminal" teminal emulation
software is irrelevant. If you system admins
are as strict as you say, they should NOT allow
telnet over the Internet. Again, I would suggest
they install SSH (and SCP) which would allow
you (and other users) to establish secure
terminal connections (with SSH) and securely
transfer files back and forth (with SCP).
Having said all this, HyperTeminal supports
various file transfer protocols such as Xmodem,
Ymodem and Zmodem as well as Kermit. You would
have to install one of these on your Solaris
system then start it on the UNIX end then use
the HyperTerminal "Transfer -> Receive File"
and select the protocol matching your server
side.