...

• CodingType$ (a StrExp) can be:

1. 1. "BASE64ENCODE", encode in Base64 code;
   2. "BASE64DECODE", decode from Bas64 code;
   3. "BASE64BINARYENCODE", encode in Base64Binary code;
   4. "BASE64BINARYDECODE", decode from Base64Binary code;

...

1. Further information on Base64 encoding is available here
2. Further information on Base64Binary encoding is available here 
3. See also Wikipedia [BASE64]

Examples

ENDECODE$("BASE64ENCODE", "Qnowledge B.V")

returns

ENDECODE$("BASE64ENCODE", "UW5vd2xlZGdlIEIuVg==")

...