1. A system for performing character interactive input/output in a half duplex block mode environment including a client workstation and a server including processor and memory, comprising: said client workstation including a client application selectively connected to a first server application written to half-duplex block mode architecture and to a second server application written to full duplex character interactive mode architecture; said client application for communicating over a half duplex block mode interface to said first server application in half-duplex block mode; said client application for communicating over said half duplex block mode interface with a second server application in full duplex character interactive input/output mode including: a display buffer for receiving a keystroke; said client application automatically transferring said keystroke from said client workstation over said half duplex block mode interface to said second server application; said second server application for processing said keystroke and responding appropriate to context of said server application; thereby transferring single keystrokes as they are entered at said client workstation even though operating in said half duplex block mode environment in which character sequences are normally transferred.