Hitachi Seiki Seicos MYII control system variables

[pieface]

Hi folks. Anyone out there know what the system variable might be for the spindle tool on the above control. We have lots of Hitachi verticals, all VM40's of varying specs, some with Yasnac controls and some with Seicos. All are Fanuc style.
Reason I want it is for tool length check macro. Trawled the manuals but I can only find the system variables for tool offset files and work offset files. Or does anyone know a good place to look for system variable lists. I wish some clever bod would make a nice website with lots of variable lists, how good would that be?
Thanks

[cogsman1]

I ran one for awhile and the programs I saved show #4400. Hope this helps.

[pieface]

Thanks. I've just sorted it. #4400 is the variable for the Sigma control (We have some of those too). The variable for spindle tool for the Seicos MYII is #57104. Only took me a day and a half. Phew!!