Reference: inputParams
inputParams(s1, ..., sN) displays a parameter input dialog box. s1, ..., sN are valid identifiers of existing variables, the values of which are to be adjusted.
Example (from waveSim.prg):
λ1 ≔ 3
λ2 ≔ 4
ν1 ≔ 0.6
ν2 ≔ 0.4
A1 ≔ 2
A2 ≔ 2.3
inputParams("λ1", "λ2", "ν1", "ν2", "A1", "A2")