X-HATCH is CADKEY shorthand for cross-hatching. 

Cross-hatch styles are line patterns that represent 
materials such as copper, glass, or steel. Use cross-
hatching to fill a specific, enclosed area. When cutting
or sectioning a part, cross-hatching helps you distinguish
open space from material.

You can choose from up to eighteen cross-hatch styles or 
customize your own cross-hatch style to suit your needs.

You can also specify the angle and distance between the
lines for each cross-hatch style. 

Each of the lines in the cross-hatch pattern are known as
hatch lines. 

Cross-hatch styles can be either single or double.
 
The following notes are about using Drawing Layout Mode
with X-HATCH.
 
Use DETAIL, XHATCH to cross-hatch something when the
boundary of the area you want to cross-hatch is made up of
all instance-specific geometry or all layout-specific
geometry. 

When you change the location of, align, or rotate an 
instance that has cross-hatching in it, the cross-hatching
moves accordingly.

Do not cross-hatch any layout-specific geometry while you
have an instance activated. If you want to cross-hatch
layout-specific geometry, first turn off the active 
instance using INSTANCE, ACTIVE.

Choose entities for cross-hatching from other instances if
they are hard to access in the active instance.

If you change the view of an instance that you've cross-
hatched using INSTANCE, MODIFY, VIEW, the cross-hatching
disappears.

If you cross-hatch in Model Mode and then enter Drawing
Layout Mode, your drawing instances won't show the
cross-hatching.

You can use cross-hatching with any of the following
options:

EDIT, BX MOVE
XFORM (all options)
CHANGE, ATTRIBUTE (color, pen #)
LEVEL, MOVE
DELETE
FILE, PATTERN

Before you cross-hatch an entity, trim or break the lines
that fall beyond the selected boundary.

To cross-hatch an entity follow the steps below:

After you choose DETAIL, X-HATCH, cursor-select a 
cross-hatch style from the X-HATCH pop-up window.

When more cross-hatch patterns exist than will fit in the
window, click on Nxt. Page in the right corner of the
pop-up window to view the new patterns. Click on Prv. Page
to go back to the original list. 

Enter, in degrees, an angle value for the slant of the
hatch lines, or press <Enter> to accept the default. 

For single cross-hatch styles, if you type 0, the lines
are horizontal. For double cross-hatch styles, if you type
0, the lines are horizontal and vertical.

Because of the way CADKEY defines certain line patterns,
Styles 15, MESH, and 18, WINDING, have fixed angles of 0
degrees. 

Enter a value for the distance between hatch lines, or
press <Enter> to accept the default. The smaller the 
value, the closer the lines; the larger the value, the
further apart the hatch lines.

For patterns with a blank line, such as STEEL and RUBBER,
the value you enter represents the distance between the 
closest lines in the pattern.

Select the entities that you want to cross-hatch, making
sure they form a closed boundary.

CADKEY treats cross-hatching as one entity. Single-select
the cross-hatch entities by indicating a cross-hatch line
in one of the extreme limits, or by choosing the WINDOW or
one of the other methods from the Selection Menu. 

When working with multiple viewports, CADKEY asks you to 
cursor select the viewport with the entities you want to
cross-hatch.

After you make your selection, choose YES from the NO/YES
menu or press <Enter>. Choose NO to continue single-
selecting entities without choosing from the Selection 
Menu. Press <Enter> after your selection.

The system begins to cross-hatch. To stop cross-hatching
at any time, press (Esc).

When CADKEY finishes cross-hatching, you return to the 
Selection Menu.

Like dimension entities, cross-hatch entities are view
dependent; cross-hatching appears only in the view in
which you created it.

To cross-hatch another entity using the same pattern,
select the new entities you want to cross-hatch. To 
cross-hatch another entity with a different pattern, 
repeat the steps listed above.

An island is an area inside another area. 

You can select islands to include cross-hatching. Cross-
hatching draws from the outermost selected boundary until
it reaches the first selected island. From there, CADKEY
stops cross-hatching until it reaches the next selected 
island and so on. Be careful when you select your 
boundaries. 

An island can be as many levels deep as you want, as long
as the island consists of a closed boundary of entities.

Cross-hatching ignores entities you don't select. Edit
entities with EDIT, BREAK to form a perfectly closed 
boundary.

Make sure you select all boundaries of an area or CADKEY
will cross-hatch the area incorrectly.

Once you select the islands you want to cross-hatch,
follow the steps above to cross-hatch an entity.
