2 Gateway addresses in a client PC

Client having O/s Win 98 SE, has to access 2 different servers as remote user.

For one application it has to access central office server thru leased(secured) line.

For another it has to access different server via tunnel. ( thru internet )

Is it possible to have 2 gateway address in a single PC in order to access both the servers. (without restarting computer)

Pls. help.