+1 You can store up to 30 bits of information in a single FILT. You AND out the first bit with ctype value 1, the second bit with ctype value 2, the third bit with ctype value 4, 8, 16, 32, 64 and 128 etc. and you just add the values together. It's good practice to keep the highest bit set all the time (ctype value 1073741824) so the BRAYs aren't stopped if you want to store a 0 value. Example: if you want to set the 1st and the 7th bit the value would be 1 + 64 + 1073741824 = 1073741889.