No way to get the GID of a worksheet

Say you are generating a multi worksheet spreadsheet and want to link your users into a specific worksheet via shared link. 

For example:

https://docs.google.com/spreadsheet/ccc?key=0AgLNyeoMpvoYdDlzcGw1MVRXM0hiemd6V3VXYWFGb2c#gid=2

While you can generate the base URL, which will load the default spreadsheet, there is no way to query for the GID.
