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Логические операторы:
Они используются повсюду, где вы сравниваете переменные, These are actually used anywhere you want to use a conditional expression, but since they are explained here in the help and are very useful to know in general, I will list them here. They are explained quite well in the help file.

Use & to indicate a logical AND in your conditions
Use | to indicate a logical OR
Use X to indicate a logical XOR (exclusive or)
Use / to indicate the same operator as previously used.
You must have all AND conditions first, and ll OR conditions next. Note that if you have both, All the ANDs are counted together first, and then the ORs, so if at least one OR is true, the whole statement is true. This is because ERM evaluates expressions left-to-right. This also makes multiple XORs very hard, if at all possible, to code.

Arithmetic operators
These were covered above, but in summary,
+ is addition
- is subtraction
* is multiplication
: is division
% is modulus

Again, all math is done left-to-right. Thus,
Code:
!!VRv1:S0+5+6*3+2;

gives v1 the value of 35 (5+6=11; 11*3=33; 33+2=35) and not 25, as algebraic order would say (6*3=18; 5+18+2=25)

String operators
H#
Set flag # to true if the z-variable is empty, and false if not.

S^TEXT^
Set the z-variable to the text between the carats. Remember that ^ and ; cannot be used in the text.

Within the text string, you can show the contents of a variable by using a % followed by the variable name, using a capitol letter instead of a lower-case one. For flags, which have no letter normally, use an F. For common variables that have no numbers, prefix them with a V. Although not listed in the help file, %Z can be used for z-variables. To display a percent-sign, use %%.

+
When working with strings, + is used to concatenate two strings. Either string may be a z-variable or text (within carats).

Questions and Answers
Question: I'm not sure what you mean when you're talking about the H# command. You're talking about flags and variables in the same statement?
Answer: There is a very nicely described example of the H option in the help file, but I will give a simple example here.
Code:
!!VRz1:H1;

This takes a look at (text) variable z1. If it is a null string (say you set it with !!VRz1:S^^;), then flag number 1 is set to false (0). If there are only spaces, tabs, new lines, etc. in z1, flag 1 wil also be 0. If there is actual text in z1, then flag 1 will be set to 1.
Copying from the help file:

Code:

!!VRz100:S^Hello!^;
!!VRz101:S^^;
!!VRz102:S^ ^;
!!VRz100:H300; flag300=1
!!VRz101:H301; flag301=0
!!VRz102:H302; flag302=0


Note that anything after the ; in any given line is a comment.