Help: Variables by Name

+	Substitutes the TCC command separator
=	Substitutes the TCC escape character
!	Last argument of the previous command
?	Exit code, last external program
_4ver	TCC version
_?	Exit code, last internal command

_batch	Batch nesting level
_batchline	Line number in current batch file.
_batchname	Full path and filename of current batch file.
_batchtype	Type of the current batch file
_battery	Battery status
_batterylife	Remaining battery life, seconds
_batterypercent	Remaining battery life, %
_bdebugger	Batch debugger active: 1, else 0
_bg	Background color at cursor position
_boot	Boot drive letter, without a colon
_build	Build number

_capslock	CapsLock on: 1, else 0
_cdroms	List of the CD-ROM drives
_childpid	Process ID of most recent child process
_ci	Current text cursor shape in insert mode
_cmdline	Current command line
_cmdproc	Command processor name
_cmdspec	Full pathname of command processor
_co	Current text cursor shape in overstrike mode
_codepage	Current code page number
_column	Current cursor column
_columns	Virtual screen width
_consolepids	Process IDs attached to this console
_country	Current country code
_cpu	CPU type
_cpuusage	CPU time usage (percent)
_ctrl	Ctrl key depressed: 1, else 0
_cwd	Current drive and directory
_cwds	Current drive and directory with trailing \
_cwp	Current directory
_cwps	Current directory with trailing \

_date	Current date
_datetime	Current date and time, yyyyMMddhhmmss
_day	Current day of the month
_detachpid	Process ID of most recent detached process
_disk	Current drive
_dname	Name of the description file.
_dos	Operating system type
_dosver	Operating system version
_dow	Current day of the week, English, short
_dowf	Current day of the week, English, full
_dowi	Current day of the week as an integer
_doy	Current day of the year
_drives	List of the existing drives
_dst	Daylight savings time: 1, else 0
_dvds	List of the DVD drives

_echo	Echo turned on: 1, else 0
_editmode	0 if in overstrike mode, 1 if in insert mode
errorlevel	Exit code, last external program
_execstr	@EXECSTR return code
_exit	TCC exit return code
_expansion	SETDOS /X value

_hdrives	List of the fixed drives
_hlogfile	Current history log file name
_host	Host name of local computer.
_hour	Current hour
_hwprofile	Windows hardware profile if defined

_idleticks	Milliseconds since the last user input
_idow	Current day of the week, local language, short
_idowf	Current day of the week, local language, full
_iftp	IFTP session active: 1, else 0
_iftps	IFTPS session active: 1, else 0
_imonth	Current month name, local language, short
_imonthf	Current month name, local language, full
_ininame	Full pathname of the current INI file
_ip	IP address(es) of local computer.
_isodate	Current date in ISO 9601 format

_lalt	left Alt key depressed: 1, else 0
_lastdisk	Last valid drive
_lctrl	Left Ctrl key depressed: 1, else 0
_logfile	Current log file name
_lshift	Left Shift key depressed: 1, else 0

_parent	Name of the parent process
_pid	TCC process ID (numeric)
_pipe	Current process is running in a pipe: 1, else 0
_ppid	Process ID of parent process

_ralt	Right Alt key depressed: 1, else 0
_rctrl	Right Ctrl key depressed: 1, else 0
_ready	List of accessible drives
_registered	Registered user name
_row	Current cursor row
_rows	Screen height
_rshift	Right Shift key depressed: 1, else 0

_scrolllock	ScrollLock on: 1, else 0
_second	Current second
_shell	Shell level
_shells	Shell level (old style)
_shift	Shift key depressed: 1, else 0
_shortcut	Pathname of shortcut that started this process
_shralias	SHRALIAS is loaded: 1, else 0
_startpath	Startup directory of current shell.
_startpid	Process ID of most recent STARTed process.
_stdin	STDIN redirected: 0, else 1
_stdout	STDOUT redirected: 0, else 1
_stderr	STDERR redirected: 0, else 1
_stzn	Name of time zone for standard time
_stzo	Offset in minutes from UTC for standard time
_syserr	Latest Windows error code

_tcfilter	Current filter in List view window
_tcfolder	Selected folder in Folders window
_tctab	Running inside Take Command: 1; else 0
_time	Current time
_transient	Current process is a transient shell: 1, else 0
_tzn	Name of current time zone
_tzo	Offset in minutes from UTC for current time zone

_unicode	Shell uses unicode for redirected output: 1, else 0
_utctime	Current UTC time
_utcdate	Current UTC date
_utcdatetime	Current UTC date and time
_utchour	Current UTC hour
_utcisodate	Current UTC date in ISO format
_utcminute	Current UTC minute
_utcsecond	Current UTC second

_virtualpc	Running inside VirtualPC: 1; else 0
_vmware	Running inside VMWare: 1; else 0
_vxpixels	Virtual screen horizontal size
_vypixels	Virtual screen vertical size

_windir	Windows directory pathname
_winfgwindow	Title of foreground window.
_winname	Name of local computer
_winsysdir	Windows system directory pathname
_winticks	Milliseconds since Windows was started
_wintitle	Current window title
_winuser	Name of current user.
_winver	Windows version number
_wow64	Running inside WOW64: 1; else 0

_fg	Foreground color at cursor position
_ftperror	Last FTP error code

_minute	Current minute
_monitors	Number of monitors
_month	Current month of the year as integer
_monthf	Current month of the year, English, full

_openafs	OpenAFS installed: 1, otherwise 0
_osbuild	Windows build number

_year	Current year
_ypixels	Physical screen vertical size in pixels