That's nice.steam portable updated, you can now login with credentials stored in .\ini\steam.ini (using d at the menu to type them in) and steam will automatically login with this even if you change pc's, keep in mind you are storing your password in plaintext, if you are fine with this feel free to use the option.
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if you're using a quicklauncher with steam make sure to choose "c" to overwrite it so you can use the new feature
Now, where's