When looking at TPX-panels, for example at the TPX Main menu you find variables 'Z' instead of 'real' Variable names. What is the explanation for this?
In panel TEN0041 there are four variables 'Z':
)MODEL _Z:uentuser; PF:Z + <Z ¬z + )RESUME
They are related to the list starting with .ZVARS located below the marker )INIT:
.ZVARS=(UENTSLCT UENTPJMP UENTLAB UENTWSTS)
The first Z is replaced with variable UENTSLCT, the second Z with UENTPJMP. The reason for using this ZVARS-list is that the names of the variables are longer than the values. The PF-key is only two bytes long but the variable name is UENTPJMP. This technique allows to keep the length of the fields as short as necessary.