It's possible to close a document without exiting AceHTML. If the document has not been saved, or if it has been modified since the last time it was saved, AceHTML will ask you to save it before closing it.
In the File
menu, select Close.
Or
In the Standard toolbar, click on the Close icon.
If the document has undergone changes which have not been saved, a message will remind you to save it. If you close a document that has never been saved, a message is displayed so that you can save it under the name of your choice.
You can also use the shortcut CTRL+W (Refer to list of shortcuts).