Pls help urgently needed "connect two projects"

hi, i need to pass my project this week and i need a code, if anyone knows this.
what i want to get is for me to call a button from another form, and here is the trick, from "another form from another project"
get what i mean? i already did this

public sub cmd1_click()
call form2.cmd2_click
end sub
now this code only performs on another form, but only in that same project.

what i want to attain is to do that from project1 to project2. hope there are someone, or a code out there that can do this thanks in advance. will be waiting here for the answers!