problem with global class

hi every body,

I have created a class in SE24, in that i have a method like status check where i had my coding. now i am not able to give a header to an internal table in that code and also i couldnt give read table statement .its prompting some syntax errors like no headers are used in OO context and similar to read table error that we cant use that statement in OO context, so how can i give a header and read a table in method ?

thanx in advance,

abhilash