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### 25.5 TUI Configuration Variables

Several configuration variables control the appearance of TUI windows.

`set tui border-kind kind`

  Select the border appearance for the source, assembly and register windows. The possible values are the following:

  `space`

    Use a space character to draw the border.

  `ascii`

    Use ASCII characters ‘`+`’, ‘`-`’ and ‘`|`’ to draw the border.

  `acs`

    Use the Alternate Character Set to draw the border. The border is drawn using character line graphics if the terminal supports them.

`set tui border-mode mode`
`set tui active-border-mode mode`

  Select the display attributes for the borders of the inactive windows or the active window. The mode can be one of the following:

  `normal`

    Use normal attributes to display the border.

  `standout`

    Use standout mode.

  `reverse`

    Use reverse video mode.

  `half`

    Use half bright mode.

  `half-standout`

    Use half bright and standout mode.

  `bold`

    Use extra bright or bold mode.

  `bold-standout`

    Use extra bright or bold and standout mode.