You have two choice:
1- Using Windows drivers. In that case you don't do anything
2- Using your printers print language. In that case you have to skip windows printer drivers.

you have to two choice for skip windows drivers:

common jobs:
first you have to write a file your printings (sample myjob.txt).
after:
1.way:

  !copy myjob.txt com1

2.way (I learned this way from another guy. This the best way):

DECLARE INTEGER CopyFile IN kernel32;
	STRING lpSrcFile, STRING lpDstFile, INTEGER bFail
CopyFile("myjob.txt","com1", 0)