You can enable Collaboration Editing if you specify two or more Spreadsheet components to share a same book model within the appropriate scope.

<?xml version="1.0" encoding="UTF-8"?>
<div apply="demo.collaboration_edit.CoeditController">
	<hlayout style="overflow-x: auto">
		<panel title="Steve Ray's Workspace" border="normal"  hflex="1">
			<panelchildren style="padding: 8px">
				<label value="Practice Room Reservation" style="padding-left:16px;font-size:16px" />
				<separator bar="true" style="margin:8px 8px 16px 16px" />
				<spreadsheet id="steveSpreadsheet" maxVisibleRows="9" maxVisibleColumns="6"
					height="270px"/>
			</panelchildren>
		</panel>
		<panel title="Jimmy Hundred's Workspace" border="normal" hflex="1" >
			<panelchildren style="padding: 8px">
				<label value="Practice Room Reservation" style="padding-left:16px;font-size:16px" />
				<separator bar="true" style="margin:8px 8px 16px 16px" />
				<spreadsheet id="jimmySpreadsheet" maxVisibleRows="9" maxVisibleColumns="6"
					height="270px" />
			</panelchildren>
		</panel>
	</hlayout>
</div>

package demo.collaboration_edit;

import java.io.IOException;

import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.WebApps;
import org.zkoss.zk.ui.event.EventQueues;
import org.zkoss.zk.ui.select.SelectorComposer;
import org.zkoss.zk.ui.select.annotation.Wire;
import io.keikai.api.Importer;
import io.keikai.api.Importers;
import io.keikai.api.model.Book;
import io.keikai.ui.Spreadsheet;

public class CoeditController extends SelectorComposer<Component> {

    @Wire
    private Spreadsheet steveSpreadsheet, jimmySpreadsheet;
     
	public void doAfterCompose(Component comp) throws Exception {
		Book book;
		super.doAfterCompose(comp);
		final Importer importer = Importers.getImporter();
		try {
			book = importer.imports(WebApps.getCurrent().getResource("/WEB-INF/books/practice_room_reservation.xlsx"),
					"practice_room_reservation.xlsx");
		} catch (IOException exception) {
			throw new RuntimeException(exception.getMessage(), exception);
		}
		if (book != null) {
			book.setShareScope(EventQueues.APPLICATION);
			steveSpreadsheet.setBook(book);
			steveSpreadsheet.setUserName("SteveRay");
			jimmySpreadsheet.setBook(book);
			jimmySpreadsheet.setUserName("JimmyHundred");
		}
	}
}