To invoke MX to “look at” a matrix file mat.ufm use a batch / command line (see 14.1):
MX mat
or to enter without any specific files in mind (e.g., to create a new .ufm matrix from a text file; see 10.5) use:
MX I
To look at multiple matrix files mat1.ufm, mat2.ufm, … it is easiest to use the MXX batch file in preference to MX. E.g.,
MXX mat1 mat2 mat3 mat4
Selected input and/or output filenames may also be set via the command line by using “key words” such as OUT, KP and KR; type “MX” for a full list and for name conventions.
In addition note that a Command Line with more than 10 “words” may be accommodated via the XCL option described in Section 14.8.