HP 3000 Manuals

SPL to HP C/XL Migration Guide

DELETE, PUSH, SET, and WITH Statements 

The SPL DELETE, PUSH, SET, and WITH statements directly manipulate the
MPE V hardware stack and registers.

In the absence of any assumed stack environment, HP C/XL has no direct
equivalent constructs.  A stack could be emulated in an array, but, in
most cases, a simple redesign is preferable.

MPE/iX 5.0 Documentation