In any of the MS Office products (Word, Excel, Powerpoint, and Outlook),  the Laserfiche integration is out of the box.  i.e. you get the button "Save to Laserfiche" from within these applications.  When you check out a document, you can also check it back in via that same button.

Are you able to do the same with other applications, specifically AutoCad if you were to use the LF API / SDK? By that I mean having the same button that offers the same functionality described in the previous paragraph.

I am aware of 3rd party offerings but would be interested to see if this is doable using the API/SDK and what else we would need to be able to achieve this if and when required.