installation script?

[sde]

no, i'm good with php/mysql. it is the vb product creation that i'm a little new at.

i'm asking if there is a way to execute a php script at the time the product is installed.

for my case, i would have this script i want executed create the additional userfield so the user won't have to. if there was a hook for "on_this_plugin_install" or something like that, then i could just add this script as a plugin, and it would be executed immediately after the product is installed.

or maybe there is another way to do this i'm not thinking of.