parameters between CIC0 transaction and BSP application

hello,

we're working with the CIC0 transaction, we want to link an URL (bsp application) into the application area, and we've to

pass parameters from SAPGUI to the bsp application. we know to associate, by customazing, an url with the application area

but the problem is that we don't know how to pass parameters. does anybody know if we have to modify the standard transaction

to do that? how? is there another way?