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Building a hex string

I need to build a hex string from two screen entered values (i.e. &scrn1 = 7A, &scrn2 = A1) that are then joined to a constant (404040) that is then passed to a program as a hex value (X?7AA1404040?) in a CL along with other parms. Currently, every time I need this program, I have to manually change the hex values and recompile. How would I accomplish this?
You can change CL variables by using their hex values. Example:

DCL VAR(&TEST) TYPE(*CHAR) LEN(1)
CHGVAR VAR(&TEST) VALUE(x''7A')

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This was last published in May 2004

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