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# Grid Control Overview

A grid is a display of data in cells. Grids are drawn on an isigraph control in a form.

Some wd commands are specific to grids and have names prefixed glgrid, for example, `glgridatt`; see the Window Driver Command Reference, gl2 commands. Apart from these wd commands, the grid is implemented in J.

The code that paints the grid is in an object derived from one or more grid classes. The main grid classes included with J are:

jzgrid | basic grid class
jtgrid | table class, extends jzgrid. Displays a function table in a grid.
jwgrid | watch class, extends jzgrid. Displays a global variable in a grid.

A demo class, jfgrid (report class) is also included.

For an introduction to the grid control, see the labs Grid Control, Grid Examples and Grid Low Level Programming

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