how we use single pin in any port by using c program for 89s51
Oops. Didn't mean to be rude. I was using IE (silly me) and it died while I was writing the previous answer.
Trevlig helg själv!
Alas, national characters doesn't work so well :(
Keil sends out this page claiming to use the utf-8 encoding, but their forum do not support utf-8.