*\input basic
 (basic.TEX 1 2 3 4)
*\halign{#\hfil⊗#\hfil\tabskip 69pt⊗#\hfil\cr

*\vrule a⊗\vrule height 12pt depth 3pt\cr

*\vbox to 16pt{}⊗⊗\vrule\cr

*\trace-1\ddt

⊗⊗⊗ restricted horizontal, spacefactor 1.0000
⊗⊗⊗ restricted horizontal, spacefactor 1.0000
⊗⊗⊗ restricted vertical, prevdepth .0000
\hbox( 12.0000 + 3.0000)x 5.8000
.\unsetbox( 4.3056 + .0000)x 5.4000, glueset 100000.0000
..\rule( * + *)x .4000
..\:a a
..\glue .0000 plus 100000.0000
.\unsetbox( 12.0000 + 3.0000)x .4000, glueset 100000.0000
..\rule( 12.0000 + 3.0000)x .4000
..\glue .0000 plus 100000.0000
\glue 1.0000
\hbox( 16.0000 + .0000)x .4000
.\unsetbox( 16.0000 + .0000)x .0000, glueset 100000.0000
..\vbox( 16.0000 + .0000)x .0000, glueset .0000
..\glue .0000 plus 100000.0000
.\unsetbox( .0000 + .0000)x .0000, glueset 100000.0000
..\glue .0000 plus 100000.0000
.\unsetbox( .0000 + .0000)x .4000, glueset 100000.0000
..\rule( * + *)x .4000
..\glue .0000 plus 100000.0000
⊗⊗⊗ vertical
⊗⊗⊗ current page:
⊗⊗⊗ nesting level 1
! OK.
(*) \trace-1\ddt
                
↑
*\cr}\ddt

⊗⊗⊗ vertical, prevdepth .0000
⊗⊗⊗ current page:
\hbox( 12.0000 + 3.0000)x 144.2000
.\glue .0000
.\hbox( 12.0000 + 3.0000)x 5.4000
..\rule( * + *)x .4000
..\:a a
..\glue .0000 plus 100000.0000
.\glue .0000
.\hbox( 12.0000 + 3.0000)x .4000
..\rule( 12.0000 + 3.0000)x .4000
..\glue .0000 plus 100000.0000
.\glue 69.0000
.etc.
\glue 1.0000
\hbox( 16.0000 + .0000)x 144.2000
.\glue .0000
.\hbox( 16.0000 + .0000)x 5.4000, glueset .0001
..\vbox( 16.0000 + .0000)x .0000, glueset .0000
..\glue .0000 plus 100000.0000
.\glue .0000
.\hbox( 16.0000 + .0000)x .4000, glueset .0000
..\glue .0000 plus 100000.0000
.\glue 69.0000
.etc.
\glue 12.0000
\hbox( .0000 + .0000)x 144.2000
.\glue .0000
.\hbox( .0000 + .0000)x 5.4000, glueset .0001
..\glue .0000 plus 100000.0000
.\glue .0000
.\hbox( .0000 + .0000)x .4000
.\glue 69.0000
.etc.
⊗⊗⊗ nesting level 0
! OK.
(*) \cr}\ddt
            
↑
*\trace-1\ddt

⊗⊗⊗ vertical, prevdepth .0000
⊗⊗⊗ current page:
\hbox( 12.0000 + 3.0000)x 144.2000
.\glue .0000
.\hbox( 12.0000 + 3.0000)x 5.4000
..\rule( * + *)x .4000
..\:a a
..\glue .0000 plus 100000.0000
.\glue .0000
.\hbox( 12.0000 + 3.0000)x .4000
..\rule( 12.0000 + 3.0000)x .4000
..\glue .0000 plus 100000.0000
.\glue 69.0000
.\hbox( .0000 + .0000)x .4000
.\glue 69.0000
\glue 1.0000
\hbox( 16.0000 + .0000)x 144.2000
.\glue .0000
.\hbox( 16.0000 + .0000)x 5.4000, glueset .0001
..\vbox( 16.0000 + .0000)x .0000, glueset .0000
..\glue .0000 plus 100000.0000
.\glue .0000
.\hbox( 16.0000 + .0000)x .4000, glueset .0000
..\glue .0000 plus 100000.0000
.\glue 69.0000
.\hbox( 16.0000 + .0000)x .4000
..\rule( * + *)x .4000
..\glue .0000 plus 100000.0000
.\glue 69.0000
\glue 12.0000
\hbox( .0000 + .0000)x 144.2000
.\glue .0000
.\hbox( .0000 + .0000)x 5.4000, glueset .0001
..\glue .0000 plus 100000.0000
.\glue .0000
.\hbox( .0000 + .0000)x .4000
.\glue 69.0000
.\hbox( .0000 + .0000)x .4000
.\glue 69.0000
⊗⊗⊗ nesting level 0
! OK.
(*) \trace-1\ddt
                
↑x
Type x again to exit:
No output file.