Points owners have access to both Points and Weeks inventory. Weeks owners have access only to Weeks inventory.
DVC deposits to both Points and Weeks, though DVC exchanges are all for full-week stays in either pool, and all check in on either Friday, Saturday, or Sunday.
Points owners may place ongoing searches, but those searches match only Weeks inventory, not Points. So a Points owner (or a mini-system owner with access to Points) should use both an ongoing search *and* check the site frequently. as the Points inventory goes quickly under normal circumstances.
If you really want to maximize your opportunities (and it is available to you) it is worth considering upgrading your RCI account to Platinum, as some DVC inventory is under the Priority Access designation. Anecdotally, it appears that more DVC inventory is Weeks than in Points, but it is hard to say for sure.