If i'm running a program off of an hdd, would that still cause reads and/or writes on the ssd, since the OS is on the ssd? For example, a web browser. It may not be on the ssd itself, but the OS is, and i'm still using the OS obviously. So, would that use up the ssd's reads/writes?
The answer to your question is yes. The OS runs a lot of routines in the background. The routines are normally hidden from view. I have a utility which shows what actually runs during and after start-up.
During web browsing it isn't just the OS and the web browser that run. Other things are happening too. For example Adobe Flash Player is running so you can watch video clips.
there may be minor read writes. It's not a big deal, its normal, it wont hurt your SSD... there is no reason to stalk your read/writes. Ours just big stuff like defrag/particular/indexing and even that won't hurt normal users