The [Tclx] package documents '''infox''' the following way:

    :   '''infox''' ''option''

Return information about Extended Tcl, or the current application. The following '''infox''' command ''option''s are available:

   '''version''':   Return the version number of Extended Tcl.
   '''patchlevel''':   Return the patchlevel for Extended Tcl.

   '''have_fchown''':   Return 1 if the `fchown` system call is available. This supports the '''-fileid''' option on the [chown] and [chgrp] commands.
   '''have_fchmod''':   Return 1 if the `fchmod` system call is available. This supports the '''-fileid''' option on the [chmod] command.
   '''have_flock''':   Return 1 if the [flock] command is defined, 0 if it is not available.
   '''have_fsync''':   Return 1 if the `fsync` system call is available and the [sync] command will sync individual files. 0 if it is not available and the sync command will always sync all file buffers.
   '''have_ftruncate''':   Return 1 if the `ftruncate` or `chsize` system call is available. If it is, the [ftruncate] command '''-fileid''' option may be used.
   '''have_msgcats''':   Return 1 if XPG message catalogs are available, 0 if they are not. The [catgets] is designed to continue to function without message catalogs, always returning the default string.
   '''have_posix_signals''':   Return 1 if [Posix] signals are available ('''block''' and '''unblock''' options available for the [signal] command). 0 is returned if Posix signals are not available.
   '''have_signal_restart''':   Return 1 if restartable signals are available ('''-restart''' option available for the [signal] command). 0 is returned if restartable signals are not available.
   '''have_truncate''':   Return 1 if the `truncate` system call is available. If it is, the [ftruncate] command may truncate by file path.
   '''have_waitpid''':   Return 1 if the `waitpid` system call is available and the [wait] command has full functionality. 0 if the wait command has limited functionality.

   '''appname''':   Return the symbolic application name of the current application linked with the Extended Tcl library. The C variable `tclAppName` must be set by the application to return an application specific value for this variable.
   '''applongname''':   Return a natural language name for the current application. The C variable `tclLongAppName` must be set by the application to return an application specific value for this variable.
   '''appversion''':   Return the version number for the current application. The C variable `tclAppVersion` must be set by the application to return an application-specific value for this variable.
   '''apppatchlevel''':   Return the patchlevel for the current application. The C variable tclAppPatchlevel must be set by the application to return an application-specific value for this variable.

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