Stop 
The Stop button ends the current operation. The ESC key also performs this function. You may also click Stop to deselect highlighted items in the drawing.
Undo
Click this button to undo past commands in your drawing. You may reverse up to 30 commands in the drawing. This function can be very useful if you discover that you made a mistake some time earlier in your drawing process: you may simply undo commands until you reach the point where you wish to start again. You may also access this function by selecting Undo from the Edit Menu. If you undo a command you wish to keep, simply click the Redo button, right next to Undo on the Toolbar.
Redo
Click Redo to reinstate commands you have removed using the Undo function. You may reinstate up to 30 undone commands.
New
Click this button to create a new drawing. If applicable, you will be prompted to save the existing drawing.
Open
Click this button to open an existing drawing without having to go through the File menu. Choose Open to open a drawing, Typical, DXF file, DWG file, defaults file, view file, bitmap image file, color map file, or Hidden Line file.
Save
Click this button to save the current drawing without having to go through the File menu. Use the Save command to save your drawing with a .cdb extension. If this is a new drawing, the Save As dialog appears and you are prompted for a name for the drawing.
Check and Save
Click this button to run a Drawing Integrity Check before saving. The Drawing Integrity Check dialog appears, allowing you to check your drawing for various problems. When the check is complete, the drawing is saved or, if not previously saved the Save As dialog appears.
Import/Export/Style Files
Click this button to load and save styles and special files.
Print
Click this button to access the Print function without having to go through the File menu. The Print Drawing dialog appears, or the Print dialog if a Render window is active.
Print Preview
This function shows you an approximate image of what your print will look like. The magnifying glass function allows you to zoom in and examine areas of the potential print image.
Set Options
Click Set Options to bring up the Options dialog, where you may set your preferences for Giza.
Load Help System
Click this button to access the help file.