Module development and code questions

Is there a module that lets you set meta tags for all pages or one that sets pages for specific ones? If there isn't, where is a good place to start looking in how to do that? I need to put a pics label on all the web pages for my site and would love to be able to put a Creative Commons header for those nodes that have one.

I've set up the ECommerce module and it seems to be working but I can't figure out to add "inventory." My "products" (which are actually subscriptions) show "sold out" and I can't find the way to establish "inventory." Has my installation failed, is the tool hidden somewhere I can't find it or do I have to change the database by hand?

There is a bug in subscriptions.module at line 72 (4.3.0 version). That line is part of concatenating an SQL query:

$queryn .= "WHERE n.status = 1 AND s.uid = $account->uid AND s.stype = \"node\" ";

The problem is that whenever the PHPSESSID cookie is empty or not yet set, $account->uid is null. This happens anytime the visitor comes to the page for the first time, since the page that sets the cookie does not yet have access to the cookie. See PHP.net documentation:

Cookies will not become visible until the next loading of a page that the cookie should be visible for. To test if a cookie was successfully set, check for the cookie on a next loading page before the cookie expires. Expire time is set via the expire parameter. A nice way to debug the existence of cookies is by simply calling print_r($_COOKIE);.

I fixed this by editing the conditional for which the script begins putting together the SQL query. Currently, this line (line 67) reads:

if (is_null($subscriptions[$account->uid])) {

I changed this to:

if ((is_null($subscriptions[$account->uid]))&&(!is_null($account->uid))) {

The result is that if there is no valid user ID for line 72, the query is skipped entirely. I haven't poked around the module enough to really be sure how subscriptions.module works in its entirety, so I'm not sure, but I would assume that $subscriptions[$account->uid] is a separate variable from $account->uid. I hope this fix doesn't entirely break the module, but perhaps the module authors can address this in future versions and/or patches. In the meantime, I will post the original error messages below, so that anyone else who encounters this problem might be able to turn this thread up in a search.

I've read a bit in the forums about the effort to enhance user access levels, such as per node, and based on taxonomy. I just read that groups.module for 4.4 isn't working yet. I am trying to figure out how to hack the blog module to make it accessible to everyone - annonymous users - and then any other defined roles, while keeping the rest of the "content" non-accessible to annonymous users.

problem:there alwasy displays a "0" in tag "view inbox (0) "
debug:the function "privatemsg_link" on privatemsg.module line 16 should include this code "global $user;"

I am wanting a mod to have the submission queue rating option to be next to the comments at the bottom of a blog post? So that its easy for people to just click on + or - to rate it and move on?

Has anyone modded this or figured out a way to do this? I have seen it on some sites, but I dont have the PHP ability. Infact I have none. I have given it a crack but I am getting extremely frustrated.