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 bdos()                Invoke DOS Function, Short Form
 _bios_disk()          Disk I/O Services, Floppy and Hard Disks
 _bios_equiplist()     Determines installed equipment on system
 _bios_keybrd()        Access keyboard I/O services
 _bios_memsize()       Reports size of system memory
 _bios_printer()       Access printer services
 _bios_serialcom()     Access serial communications I/O services
 _bios_timeofday()     Access ROM-BIOS system clock services
 _dos_allocmem()       Allocate a block of memory
 _dos_close()          Close a file handle
 _dos_creat()          Create a file
 _dos_creatnew()       Create a new file
 dosexterr()           Get extended error codes
 _dos_findfirst()      Find the first matching file
 _dos_findnext()       Find the next matching file
 _dos_freemem()        Free a block of memory
 _dos_getdate()        Get the system date
 _dos_getdiskfree()    Get amount of free space on disk
 _dos_getdrive()       Get identifier of current disk drive
 _dos_getfileattr()    Get file or directory attributes
 _dos_getftime()       Get date and time file last modified
 _dos_gettime()        Get system time
 _dos_getvect()        Get the value of an interrupt vector
 _dos_keep()           Install a TSR program
 _dos_open()           Open an existing file
 _dos_read()           Read a file
 _dos_setblock()       Change the size of a memory block
 _dos_setdate()        Set the system date
 _dos_setdrive()       Set the default disk drive
 _dos_setfileattr()    Set file or directory attributes
 _dos_setftime()       Set file date and time
 _dos_settime()        Set the system time
 _dos_setvect()        Set an interrupt vector value
 _dos_write()          Write to a file
 dosexterr()           Get extended error codes
 int86()               Execute 8086 Software Interrupt
 int86x()              Set Seg. Registers and Execute Software
 intdos()              Invoke DOS Function, Long Form
 intdosx()             Set Seg Regs and Invoke DOS Function, Long Form