Opening an eclipse project through command prompt or batch file

I am building an application that is for testing using Selenium Java tool. Is there any way to open an existing eclipse project from the command line or through a batch file so that I can allow the users to select the testproject which is in Java with just a click of a button?

I found that this command if for building a project

eclipsec.exe -noSplash -data "D:\Source\MyProject\workspace" -application org.eclipse.jdt.apt.core.aptBuild

But I couldn't find one for opening one.

If you omit -application and simply run eclipse.exe -data "D:\Source\MyProject\workspace", then your workspace will be opened. If you have only one project there then issue is resolved. If not, you can easily create new workspace with a link to your existing project.