A program, some TECO macros, and some small modifications to existing systems software have been written, called PRO, whose purpose is to reduce the large number of control languages and system programs it has been necessary to know about and the large amount of redundant typing it has been necessary to do to effectively use the MAC PDP-6 system. PRO allows a user knowing the command languages on only TECO, DOT, and PRO to effectively edit and debug email absolute programs with a minimum of command typing overhead (systems of this sort are called control P features for historic reasons). The remainder of this memo, which describes PRO and its use in detail, assumes some knowledge of TECO, DOT, and the MAC PDP-6 system. (In this memo the symbol $ always stands for the character ALT MOD).
