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Built-in constant identifiers are automatically defined by the compiler. Unlike reserved words, you can declare your own identifiers with the same spelling as built-in constant identifiers, if you do then your declaration will override the definition made by the compiler. The built-in constant identifiers are listed below:

• appendmode
• dir_bit
• false
• feature_calldll
• feature_closedir
• feature_clrscr
• feature_delay
• feature_gotoxy
• feature_idispatch
• feature_intr
• feature_keypressed
• feature_mysql
• feature_odbc
• feature_opendir
• feature_popen
• feature_readdir
• feature_readkey
• feature_rewinddir
• feature_textbackground
• feature_textcolor
• feature_wherex
• feature_wherey
• grp_r
• grp_w
• grp_x
• maxbyte
• maxchar
• maxint
• maxword
• nil
• oth_r
• oth_w
• oth_x
• platform_dos
• platform_error
• platform_fbsd
• platform_linux
• platform_os2
• platform_solaris
• platform_solaris_sparc
• platform_win32
• readmode
• rsdefault
• rsdynamic
• rsforward
• rskeyset
• rsstatic
• sql_tc_all
• sql_tc_ddl_commit
• sql_tc_ddl_ignore
• sql_tc_dml
• sql_tc_none
• true
• usr_r
• usr_w
• usr_x
• writemode