[ale] HOW2 copy text from an Xwindow that is longer than a screenfull ?

[ccthomas at joimail.com (Courtney Thomas)]

I need to be able to copy a program's xterm screen output to another
program. That output is a lot longer than one screen full.

I am using a vt100 terminal emulation xterm which permits selecting and
copying such output but said output is many screenfulls.

For reasons I am neglecting, I need to not simply redirect this output
to a file and send the file.

I need to be able to redirect the output to a file, cat the file, and
THEN select&copy the cat-ed file's output...to another program screen.

Anyone know how to accomplish this ?

Thank you,

Courtney