you cant.... the only way is to find a program that splits your system into 2 which will make everything run slow and your chip set might fry from it.... its kinda like overclocking but instead of making your computer run faster it makes it so you have like 2 computers in 1..... and i almost guarantee your computer isn't good enuf for it
please if anyone nows how can i farm by myselfe whit a single computer please tell me