System Service Groups

                             Character I/O 
                             Device Drivers
                             Directory and File
                             Display
                             Disk Drives
                             File I/O
                             File I/O via FCB
                             Memory Management
                             Miscellaneous
                             National Language Support
                             Network and File-Sharing
                             Printer
                             Process Control
                             System Information
                             TSR/Popup Functions
DOS Function Lists ───────────────────────────────────────────────────────────
                             Quick Reference Subset
                             Complete list, by Fn Number
                             2.0+ Fns, by Version
                             Superseded DOS Functions
                             DOS Interrupts