(xemacs.info)Tabs in Picture

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24.3 Picture Mode Tabs
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Two kinds of tab-like action are provided in Picture mode.
Context-based tabbing is done with `M-<TAB>' (`picture-tab-search').
With no argument, it moves to a point underneath the next "interesting"
character that follows whitespace in the previous non-blank line.
"Next" here means "appearing at a horizontal position greater than the
one point starts out at".  With an argument, as in `C-u M-<TAB>', the
command moves to the next such interesting character in the current
line.  `M-<TAB>' does not change the text; it only moves point.
"Interesting" characters are defined by the variable
`picture-tab-chars', which contains a string of characters considered
interesting.  Its default value is `"!-~"'.

   <TAB> itself runs `picture-tab', which operates based on the current
tab stop settings; it is the Picture mode equivalent of
`tab-to-tab-stop'.  Without arguments it just moves point, but with a
numeric argument it clears the text that it moves over.

   The context-based and tab-stop-based forms of tabbing are brought
together by the command `C-c <TAB>' (`picture-set-tab-stops'.)  This
command sets the tab stops to the positions which `M-<TAB>' would
consider significant in the current line.  If you use this command with
<TAB>, you can get the effect of context-based tabbing.  But `M-<TAB>'
is more convenient in the cases where it is sufficient.