Yes you can. You can use a special URL for that. To bypass the Add 2 Home screen and splash screen add #0 after your url. To just bypass the Add 2 Home screen but still use the splash screen use #index. These options can also be used with offline mode.
For web masters: This way you can use your iGenApps web app in a widget or iframe too! Just like we have on our PC/Mac version of igenapps.com or the PC/Mac view of a web app.