Informatica provides two code page access functions that return the code page of the Integration Service and two that return the code page of the data the external procedure processes. When the Integration Service runs in Unicode mode, the string data passing to the external procedure program can contain multibyte characters. The code page determines how the external procedure interprets a multibyte character string. When the Integration Service runs in Unicode mode, data processed by the external procedure program must be two-way compatible with the Integration Service code page.