Real name of commands: 

CLEAR DEBUGGER (CLEAR DEBUG)
SET("BROWSEIMECONTROL") (SET BROWSEIME)
SET("TITLES") (SET TITLE)
SET("SYSMENUS") (SET SYSMENU)

dBaseIII Compatibility

CLEAR SCREEN
CLOSE PRINTER (?)
DISPLAY HISTORY [TO PRINTER [PROMPT] | TO FILE FileName]
SET ATTRIBUTES TO
SET CATALOG
SET CATALOG TO
SET DESIGN
SET ENCRYPTION
SET HISTORY
SET HISTORY TO
SET INSTRUCT 
SET MENU
SET TITLE
SET("ATTRIBUTES")
SET("CATALOG")
SET("CATALOG", 1)
SET("DESIGN")
SET("ENCRYPTION")
SET("HISTORY")
SET("HISTORY ", 1)
SET("INSTRUCT")
SET("MENU")
SET("TITLE")
LIST HISTORY [TO PRINTER [PROMPT] | TO FILE FileName]
Logical Values .Y. and .N.
MODIFY VIEW (.Vue file)

dBaseIII+ LAN Pack Compatibility

DISPLAY USERS [TO PRINTER [PROMPT] | TO FILE FileName]
ACCESS() (Discontinued in VFP 7)
LIST USERS [TO PRINTER [PROMPT] | TO FILE FileName]
LOGOUT

FoxBase Compatibility

FOXDOC (Discontinued in VFP 7) -- Brings up GetFile(). VFP 6 runs it.
FOXGEN (Discontinued in VFP 7)
FOXGRAPH (Discontinued in VFP 7)
FOXVIEW (Discontinued in VFP 7)
NETWORK()
PKXARC (Discontinued in FP 2.5 ?)

FoxPro Compatibility

FILER (Discontinued in VFP as a command. Alternative ->Filer.DLL)
CPNOTRANS()
ISMARKED() (?)
PACK()
SET DIRECTORY
SET("DIRECTORY")
SET UDFPARMS (Value/Reference)
UNPACK()

dBase IV Compatibility

CALL()
CHANGE()
COMPLETED()
FIXED() (?)
ID()
LKSYS() (Removed in VFP 7?)
RESET
ROLLBACK()
RUN()
SET DBTRAP
SET IBLOCK
SET LDCHECK
SET MBLOCK TO
SET PAUSE
SET PRECISION
SET SQL
SET TRAP
SET("DBTRAP")
SET("IBLOCK")
SET("LDCHECK")
SET("MBLOCK")
SET("PAUSE")
SET("PRECISION")
SET("SQL")
SET("TRAP")

FoxPro/Mac compatibility

ON APLABOUT
ON MACHELP
ON("APLABOUT")
ON("MACHELP")
RUNSCRIPT
SET APLABOUT
SET MACDESKTOP
SET MACHELP
SET XCMDFILE TO
SET("APLABOUT")
SET("MACDESKTOP")
SET("MACHELP")
SET("XCMDFILE") in FFC! -- EDITSOURCE(HOME(1) + [FFC\_ENVIRON.VCX], 41, [_Set], [Set]) 

SYS Functions

SYS(104) -- Accepts 0 and 1 for second parameters, nothing returned.
SYS(986) -- VFP 9 only. Returns logical. 2nd parameter between 0 and 10. 
SYS(988) -- VFP 9 only. Only logical accepted as second parameter.
SYS(989) -- VFP 9 only. Relates to the debugger.
SYS(999) -- Brings up bitmap images in VFP.
SYS(1002) -- For 2.5 and 2.6 DOS standard version. Value rises.
SYS(1003) -- For 2.5 and 2.6 DOS standard version. Value rises.
SYS(1004) -- All versions. Some memory function.
SYS(1005) -- Some sort of incrementing memory function. Related to SYS(1006).
SYS(1006) -- See SYS(1005).
SYS(1007) -- In FoxPro, some sort of incrementing memory function.
SYS(1008) -- See SYS(1007).
SYS(1009) -- Returns "0".
SYS(1010) -- Returns "1" for standard versions of FoxPro 2.5 and 2.6 DOS. Otherwise returns "0".
SYS(1011) -- Returns # of memory handles in use. Documented in VFP 7.0.
SYS(1012) -- Strange memory function.
SYS(1013) -- Vaguely a memory related function.
SYS(1014) -- FPD and FPW function. Available memory?
SYS(1015) -- Clears cached bitmap in FPW?
SYS(1016) -- Returns allocated part of the memory handle pool.
SYS(1017) -- Maximum amount of memory used by an application?
SYS(1018) -- Displays message about Index Lock during TableUpdate().
SYS(1020) -- Displays "Resuming Normal Operation."
SYS(1021) -- Displays "Diagnostic Mode Entered"
SYS(1022) 
SYS(1029) -- Puts up "dBaseIII" like menu. Can be buggy. Accepts numeric 2nd parameter.
SYS(1030) -- VFP 9 only. Only 0 and 1 accepted as second parameter.
SYS(1039) -- "Works" in 2.6. What does this do?
SYS(1078) -- VFP 5.0 and later. Only numeric 2nd parameter. Nothing returned.
SYS(1079) -- VFP 8 and later. Crashes VFP.
SYS(1101) -- Same value as SYS(3050, 1).
SYS(1102) -- Memory function of some sort.
SYS(1103) -- Memory function of some sort.
SYS(1104) -- Purge unused buffers.
SYS(1105) -- Memory function of some sort.
SYS(2008) -- 2nd parameter only accepts character values. Nothing returned.
SYS(2024) -- Returns "N". Documented in VFP 9.
SYS(2025) -- FPW 2.6 A and above -- returns "Y".
SYS(2026) -- Returns "N".
SYS(2027) -- Pathing between MS-DOS and Mac. Now undocumented.
SYS(2050) -- VFP 7 and above. Only accepts 0 - 10 as second parameter.
SYS(2338) -- VFP 6 and above. Accepts 8 characters as 2nd parameter and returns it.
SYS(2400) -- VFP 7 and above. Relates to FoxCode.
SYS(2701) -- VFP 8 and above. Related to Active Accessability.
SYS(2850) -- VFP 8. Buggy.
SYS(2901) -- VFP 7 and above. Reads parts of executable and localization file.
SYS(3001) -- VFP 9. And 2nd parameter accepted.
SYS(3070) -- VFP 7 and 8. Set Talk on. "IceCap profiling turned on" displayed.
SYS(3071) -- VFP 7 and 8. Set Talk on. "IceCap profiling turned off" displayed.
SYS(3090) -- VFP 6 and later. Numeric value returned, only 0 and 1 accepted as parameter.
SYS(3094) -- Same as SYS(3095).
SYS(3100) -- VFP 9. Accepts non-negative number as 2nd parameter. Nothing returned.
SYS(3102) -- VFP 9. Logial second parameter.
SYS(4000) -- "Feature Not Available" returned.
SYS(4001) -- "Feature Not Available" returned.
SYS(4003) -- "Feature Not Available" returned.
SYS(4004) -- "Feature Not Available" returned.
SYS(4010) -- "Feature Not Available" returned.
SYS(4015) -- Related to menu generation. Ties to OS?
SYS(4201) -- VFP 6 through VFP 8 returns blank DateTime() value.
SYS(4204) -- Related to ActiveDocs.
SYS(4205) -- Related to ActiveDocs.
SYS(2147483648) -- Returns SYS(0).
SYS(8589934592) -- Returns SYS(0). Add value, matches value.

MODIFY CLASS IN WINDOW

_NETWARE
_ORACLE
_SQLSERVER
ZORDERSET