The REXX language has three special variables: RC, SIGL, and RESULT. REXX/CICS sets these variables during particular situations and you can use them in an expression at any time. If REXX/CICS did not set a value, a special variable has the value of its own name in uppercase, as do other variables in REXX. You can use two special variables, RC and SIGL, to help diagnose problems within programs.