Module development and code questions

I have several cron jobs need to run in different term. Does it mean that I need several files which are like "cron.php" to call the hook functions in module?

I can't figure out where to download the invite_api for 4.7. I had the 4.6 one, and it worked, but suddenly when I went to domain.com/invite it gives me access denied errors, so I decided I would update it, but I can't find it.

Plz look at this post: http://www.musicparking.com/dl/2006/07/three_days_grace_its_all_over
IN this post No flash "play" icon dispay (the right form should like this http://www.musicparking.com/dl/2006/07/razorlight_in_the_morning )and if you click "Click to play "then no listening but the system display the download link.What's wrong with the system? How can I fix that problem?

Thanks

how to add a net money modules just like user point modules ?
1、 user can use his net money to buy product。
2、administrator can add user's net money after get user's real money.

so I only want htmlarea to work in a certain area on a certain module page so I definited it like this:

node/*/feature.edit-body

I get htmlarea in the textarea when I go through create content, but then later when I go back to edit it I don't get the htmlarea controls for that area

any idea how I can fix this? thanks!

I'm trying to create a new permission for the comments module. I know that I can add a new permission to the comment_perm() array and the new permission will show up in /admin/access. What I don't know how to do is then create all the supporting code to enable that permission. I want to be able to grant any user the ability to delete any comment they've left anywhere on the site. I'm really struggling to find out where/how/why you implement the new access permissions, or even where in Drupal's "documentation" to find any examples.

Any offerings greatly appreciated.