open pdf in new window, interact with third-party plugin?

I would like to create a program that will open a pdf in a new window, automatically save the pdf on any change to the document, and will close the window when the program determines is appropriate. However, I would also like the pdf window to interact with a third-party pdf-signing plugin like it currently does in Acrobat Reader DC. Currently, when the user clicks on a signature field in Acrobat Reader DC, a signature box pops up so the user can apply his/her signature and then when they click Accept, the signature box closes and the signature field on the pdf is updated. If I create a "plug-in" that opens a pdf in a new window, will that window still interact with the third-party plugin in the same way Adobe Reader DC does? Would I use the AcroPDF object’s LoadFile method? I am trying to determine what is and is not possible before embarking down a path, so thanks in advance for any help.