@schema_change_script usage

When does the script specified in the @.schema_change_script parameter for
the sp_repladdcolumn and sp_repldropcolumn get fired ? Is it after the
adding and dropping of the column on all ends or before ?
Thanks
after.
Hilary Cotter
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"Hassan" <fatima_ja@.hotmail.com> wrote in message
news:ObWssO%23VFHA.2796@.TK2MSFTNGP09.phx.gbl...
> When does the script specified in the @.schema_change_script parameter for
> the sp_repladdcolumn and sp_repldropcolumn get fired ? Is it after the
> adding and dropping of the column on all ends or before ?
> Thanks
>