let's take one example.Suppose on cics screen is capable of performing 4 actvities like on PF7 it will scroll backward, on PF8 it will scroll Forward, on PF10 it will scroll LEft and on PF11 it will scroll to right direction. Then u can just keep on varible as read-direction.
so you can set the value of varibale read-direction as the key pressed. Based upon that u can do certain operation.
Or like u can validate the fuction name it supports, thru condition name...
01 valid-function PIC x(10).
88 func1 value 'one'
88 func2 value 'two'.
like this way u can use just one varibale and get the result. Hope tis is clear to you. Let us know if u have any clarification.