Choosing a CM Installation Method
There are two methods of fixing the compilers on your system: integral into Pub.Sys or isolated in the Robelle account. The isolated method is best for new or trial-period users, because it is faster to install and easier to remove later. You can start with the isolated method and convert easily to the integral method later.
Integral Method. The compilers in Pub.Sys are “fixed” directly and a segment is added to the System SL. The standard :Cobol and 
ascal commands of MPE will then compile Qedit workfiles. :Sysdump is used to make a new cold load tape for the next time you must boot the system.
Isolated Method. The MPE compilers are copied into the Q.Robelle group and the original compilers are left in the Pub.Sys group. No code is added to the System SL. Because the “Qedit” compilers are not in Pub.Sys, you cannot compile Qedit workfiles except from within Qedit.