working popup window input handling

assets/disk0/home/hdk/what_does_this_do.txt

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+TSVM Hardware Development Kit
+
+Codes in the new computer hardware (e.g. EEPROM) are decrypted, decompressed
+then executed, so your program must be minified, compressed, then encrypted to
+be runnable, and this entire process is called "compiling".
+
+Do note that this "encryption" is highly insecure; its only purpose is to deter
+the casual attempts at cracking.
+
+## From Your Readable Code to Binary
+
+1. The source code is optionally minified. As minifying tool is not provided
+   (yet!), external tools must be used.
+2. Pass your code to `compile.js` to compress and encrypt the source.
+3. Pass the .bin file to the ROM writer to bake your code to the ROM.
+
+## From The Binary to Readable Code
+
+1. Download the code in the ROM to your working computer using ROM reader.
+2. Pass your .bin to `decompile.js` to decrypt and uncompress the file.
+
+Note that both processes use `enc.js` internally, so make sure the file exists
+on the working directory.