find text included in the standard texts in scripts

Hi experts,

"INCLUDE &T166P-TXNAM& OBJECT &T166P-TDOBJECT& ID &T166P-TDID& LANGUAGE &"

i want to find the text included in this command.

I tried but i didn,t get.I tried in this way.

go to se37-> type READ_TEXT FM and execute after that it is asking parameters like this

name, object, id.i don,t no what i type in this parameters.I tried in SO10 also

i want to find the text included in this command?

this statement is wrote in the purchase order script.

pls help me in this. pls give me steps .