Module development and code questions

I have made two posts related to dynamic dropdown box but no reply so far, everytime i refine my question (questions are posted only after search results (drupal.org) returned no desired results).

My two posts are here,

Original version,
http://drupal.org/node/12223

Refined version,
http://drupal.org/node/12262

this post is still refined, here is the what i want,

Hi!

Yust wondering if anybody ported the contact.module to drupal 4.5...

Someone know when Article and Glossary modules for 4.5 may be ready?
I`ll wait them so much :)

Hi -

In the `comments` table of the Drupal database, what does the `pid` column stand for? I'm with http://www.applefritter.com and we're playing with writing some different display and comment code for Drupal threads, and we'd like to keep full backward compatability with the existing Drupal install.

I poked around, but I haven't been able to find any documentation on what various columns stand for. If anyone can point me to any docs that may exist, it'd be great.

Thank you.

I know the title isn't very descriptive, but here goes. I'm writing a mailing list module right now and am having trouble with one aspect. I already have a few options available such as stripping attachments based on mime type and archiving using the node and comment system. I am now trying to get allowed attachments to be attached and archived as node attachments. The only problem is I can't figure out which function is called to attach a file to a node. I'm hoping to use the upload_nodeapi or a file.inc function. Any ideas would be appreciated.

Joe

Is there any way for a module to find out that it has been de-activated by being deselected from the enabled modules on the system admin/modules page?

I have some clear up work on the database I would like to do at this point