PROC is the name of PICK operating system's procedure language. PROC is comparable to a UNIX shell script or a Windows batch file, and has similar features such as control-flow constructs, file manipulation, subroutine calls, and terminal input and output. The PROC language itself consists of terse macro commands. A PROC script contains a sequence of PROC language macros and PICK TCL commands. A PROC script is often used as a "front-end" for a program or application, interactive or not.

PROC utilizes two input buffers (primary and secondary), two output buffers (primary and secondary), and 9 file buffers.